diff --git a/assets/js/phoenix_live_view/view.js b/assets/js/phoenix_live_view/view.js
index 56a8d99aec..9fb8a087dd 100644
--- a/assets/js/phoenix_live_view/view.js
+++ b/assets/js/phoenix_live_view/view.js
@@ -14,6 +14,7 @@ import {
   PHX_CLIENT_ERROR_CLASS,
   PHX_SERVER_ERROR_CLASS,
   PHX_FEEDBACK_FOR,
+  PHX_FEEDBACK_GROUP,
   PHX_HAS_FOCUSED,
   PHX_HAS_SUBMITTED,
   PHX_HOOK,
@@ -104,7 +105,8 @@ let serializeForm = (form, metadata, onlyNames = []) => {
   for(let [key, val] of formData.entries()){
     if(onlyNames.length === 0 || onlyNames.indexOf(key) >= 0){
       let input = elements.find(input => input.name === key)
-      if(!(DOM.private(input, PHX_HAS_FOCUSED) || DOM.private(input, PHX_HAS_SUBMITTED))){
+      let isUnused = !(DOM.private(input, PHX_HAS_FOCUSED) || DOM.private(input, PHX_HAS_SUBMITTED))
+      if(isUnused && !(submitter && submitter.name == key)){
         params.append(prependFormDataKey(key, "_unused_"), "")
       }
       params.append(key, val)
diff --git a/assets/test/view_test.js b/assets/test/view_test.js
index b502007f12..d44c7d9f5b 100644
--- a/assets/test/view_test.js
+++ b/assets/test/view_test.js
@@ -1049,7 +1049,6 @@ describe("View + Component", function(){
       expect(el.querySelector(`[phx-feedback-for="${last_name.name}"`).classList.contains("phx-no-feedback")).toBeTruthy()
 
       view.channel.nextValidate({"user[first_name]": null, "user[last_name]": null, "_target": "user[last_name]"})
-      DOM.putPrivate(last_name, "phx-has-focused", true)
       view.pushInput(last_name, el, null, "validate", {_target: last_name.name})
       window.requestAnimationFrame(() => {
         expect(el.querySelector(`[phx-feedback-for="${first_name.name}"`).classList.contains("phx-no-feedback")).toBeFalsy()
@@ -1133,7 +1132,6 @@ describe("View + Component", function(){
       expect(el.querySelector("[phx-feedback-for=\"mygroup\"]").classList.contains("phx-no-feedback")).toBeTruthy()
 
       view.channel.nextValidate({"user[first_name]": null, "user[last_name]": null, "user[email]": null, "_target": "user[first_name]"})
-      DOM.putPrivate(first_name, "phx-has-focused", true)
       view.pushInput(first_name, el, null, "validate", {_target: first_name.name})
       window.requestAnimationFrame(() => {
         expect(el.querySelector(`[phx-feedback-for="${first_name.name}"`).classList.contains("phx-no-feedback")).toBeFalsy()
@@ -1412,4 +1410,4 @@ describe("DOM", function(){
     expect(target.checked).toEqual(true)
     expect(target.id).toEqual("bar")
   })
-})
\ No newline at end of file
+})