diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/error.txt b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/error.txt
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/expected.html b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/expected.html
new file mode 100644
index 0000000000..bc5b3c817e
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/expected.html
@@ -0,0 +1,18 @@
+
+
+
+
+
+
+
+
+ a
+
+
+ b
+
+
+
+
+
+
\ No newline at end of file
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/index.js b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/index.js
new file mode 100644
index 0000000000..d5a55ceefa
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/index.js
@@ -0,0 +1,3 @@
+export const tagName = 'x-parent';
+export { default } from 'x/parent';
+export * from 'x/parent';
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/child/child.html b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/child/child.html
new file mode 100644
index 0000000000..e73ff13018
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/child/child.html
@@ -0,0 +1,6 @@
+
+
+ Default fallback slot content
+ Named fallback slot content
+
+
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/child/child.js b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/child/child.js
new file mode 100644
index 0000000000..4cdde3624c
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/child/child.js
@@ -0,0 +1,6 @@
+import { LightningElement } from 'lwc';
+
+export default class Child extends LightningElement {
+ static renderMode = 'light';
+ item = { id: 99, name: 'ssr' };
+}
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/parent/parent.html b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/parent/parent.html
new file mode 100644
index 0000000000..2a471e81d4
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/parent/parent.html
@@ -0,0 +1,9 @@
+
+
+ a
+
+ default {data1.id} - {foo}
+
+ b
+
+
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/parent/parent.js b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/parent/parent.js
new file mode 100644
index 0000000000..04ba775321
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-2/modules/x/parent/parent.js
@@ -0,0 +1,5 @@
+import { LightningElement } from 'lwc';
+
+export default class Parent extends LightningElement {
+ foo = 'bar';
+}
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/error.txt b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/error.txt
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/expected.html b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/expected.html
new file mode 100644
index 0000000000..0ef40cedf9
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/expected.html
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/index.js b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/index.js
new file mode 100644
index 0000000000..d5a55ceefa
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/index.js
@@ -0,0 +1,3 @@
+export const tagName = 'x-parent';
+export { default } from 'x/parent';
+export * from 'x/parent';
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/child/child.html b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/child/child.html
new file mode 100644
index 0000000000..d6e0337dfa
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/child/child.html
@@ -0,0 +1,2 @@
+
+
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/child/child.js b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/child/child.js
new file mode 100644
index 0000000000..4cdde3624c
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/child/child.js
@@ -0,0 +1,6 @@
+import { LightningElement } from 'lwc';
+
+export default class Child extends LightningElement {
+ static renderMode = 'light';
+ item = { id: 99, name: 'ssr' };
+}
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/parent/parent.html b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/parent/parent.html
new file mode 100644
index 0000000000..2a471e81d4
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/parent/parent.html
@@ -0,0 +1,9 @@
+
+
+ a
+
+ default {data1.id} - {foo}
+
+ b
+
+
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/parent/parent.js b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/parent/parent.js
new file mode 100644
index 0000000000..04ba775321
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-inside-3/modules/x/parent/parent.js
@@ -0,0 +1,5 @@
+import { LightningElement } from 'lwc';
+
+export default class Parent extends LightningElement {
+ foo = 'bar';
+}
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/error.txt b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/error.txt
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/expected.html b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/expected.html
new file mode 100644
index 0000000000..27b1cb5b2f
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/expected.html
@@ -0,0 +1,27 @@
+
+
+
+
+
+
+
+ 1 default 99 - bar
+
+
+
+
+ 5 default 99 - bar
+
+
+
+
+
+
+
+
+ Fallback slot content 3
+
+
+
+
+
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/index.js b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/index.js
new file mode 100644
index 0000000000..d5a55ceefa
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/index.js
@@ -0,0 +1,3 @@
+export const tagName = 'x-parent';
+export { default } from 'x/parent';
+export * from 'x/parent';
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/child/child.html b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/child/child.html
new file mode 100644
index 0000000000..e9940b3442
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/child/child.html
@@ -0,0 +1,8 @@
+
+
+ Fallback slot content
+ Fallback slot content 1
+ Fallback slot content 2
+ Fallback slot content 3
+
+
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/child/child.js b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/child/child.js
new file mode 100644
index 0000000000..4cdde3624c
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/child/child.js
@@ -0,0 +1,6 @@
+import { LightningElement } from 'lwc';
+
+export default class Child extends LightningElement {
+ static renderMode = 'light';
+ item = { id: 99, name: 'ssr' };
+}
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/parent/parent.html b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/parent/parent.html
new file mode 100644
index 0000000000..db127137f4
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/parent/parent.html
@@ -0,0 +1,13 @@
+
+
+
+ 1 default {data1.id} - {foo}
+
+ 2 default {data1} - {foo}
+ 3 slot1 {data1} - {foo}
+ 4 slot2 {data1} - {foo}
+
+ 5 default {data1.id} - {foo}
+
+
+
diff --git a/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/parent/parent.js b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/parent/parent.js
new file mode 100644
index 0000000000..04ba775321
--- /dev/null
+++ b/packages/@lwc/engine-server/src/__tests__/fixtures/scoped-slots/mixed-with-light-dom-slots-outside-2/modules/x/parent/parent.js
@@ -0,0 +1,5 @@
+import { LightningElement } from 'lwc';
+
+export default class Parent extends LightningElement {
+ foo = 'bar';
+}