diff --git a/e2e-tests/tests/plan-merge.test.ts b/e2e-tests/tests/plan-merge.test.ts
index 69f7794193..f6253bb238 100644
--- a/e2e-tests/tests/plan-merge.test.ts
+++ b/e2e-tests/tests/plan-merge.test.ts
@@ -98,3 +98,64 @@ test.describe.serial('Plan Merge', () => {
     await expect(page.locator('input[name="start-time"]')).toHaveValue(newActivityStartTime);
   });
 });
+
+test.describe.serial('Plan Merge with Deleted Source Plan', () => {
+  const newActivityStartTime: string = '2022-005T00:00:00';
+  const planBranchName = uniqueNamesGenerator({ dictionaries: [adjectives, colors, animals] });
+
+  test('Add an activity to the parent plan', async () => {
+    await plan.addActivity('GrowBanana');
+  });
+
+  test('Create a branch', async ({ baseURL }) => {
+    await plan.createBranch(baseURL, planBranchName);
+  });
+
+  test('Change the start time of the activity on the branch', async () => {
+    await page.waitForTimeout(2000);
+    const row = await page.getByRole('row', { name: 'GrowBanana' });
+    await row.waitFor({ state: 'visible' });
+    await row.first().click();
+    await page.waitForSelector('.activity-header-title-edit-button:has-text("GrowBanana")', {
+      state: 'visible',
+    });
+    await page.locator('input[name="start-time"]').click({ position: { x: 2, y: 2 } });
+    await page.locator('input[name="start-time"]').fill(newActivityStartTime);
+    await page.locator('input[name="start-time"]').press('Enter');
+    await plan.waitForToast('Activity Directive Updated Successfully');
+  });
+
+  test('Create a merge request from branch to parent plan', async () => {
+    await page.getByText(planBranchName).first().click();
+    await page.getByText('Create merge request').click();
+    await page.getByRole('button', { name: 'Create Merge Request' }).click();
+    await plan.waitForToast('Merge Request Created Successfully');
+  });
+
+  test('Delete source plan', async () => {
+    await plans.goto();
+    await plans.deletePlan(planBranchName);
+  });
+
+  test('Switch to parent plan', async () => {
+    await plan.goto();
+  });
+
+  test('Start a merge review', async ({ baseURL }) => {
+    await page.getByRole('button', { name: '1 incoming, 0 outgoing' }).click();
+    await page.getByRole('button', { name: 'Review' }).click();
+    await page.waitForURL(`${baseURL}/plans/*/merge`);
+    await page.waitForTimeout(250);
+  });
+
+  test('Complete the merge review', async ({ baseURL }) => {
+    await page.getByRole('button', { name: 'Approve Changes' }).click();
+    await page.waitForURL(`${baseURL}/plans/${plans.planId}/merge`);
+    await page.waitForTimeout(250);
+  });
+
+  test('Make sure the start time of the activity in the parent plan now equals the start time of the activity in branch', async () => {
+    await page.getByRole('gridcell', { name: 'GrowBanana' }).first().click();
+    await expect(page.locator('input[name="start-time"]')).toHaveValue(newActivityStartTime);
+  });
+});