diff --git a/packages/react-dom-bindings/src/events/ReactDOMEventReplaying.js b/packages/react-dom-bindings/src/events/ReactDOMEventReplaying.js
index 5fa920a13f0fa..59c2920778008 100644
--- a/packages/react-dom-bindings/src/events/ReactDOMEventReplaying.js
+++ b/packages/react-dom-bindings/src/events/ReactDOMEventReplaying.js
@@ -537,7 +537,8 @@ export function retryIfBlockedOn(
 
   if (enableFormActions) {
     // Check the document if there are any queued form actions.
-    const root = unblocked === document ? unblocked : unblocked.ownerDocument;
+    // If there's no ownerDocument, then this is the document.
+    const root = unblocked.ownerDocument || unblocked;
     const formReplayingQueue: void | FormReplayingQueue = (root: any)
       .$$reactFormReplay;
     if (formReplayingQueue != null) {
diff --git a/packages/react-dom-bindings/src/server/fizz-instruction-set/ReactDOMFizzInstructionSetShared.js b/packages/react-dom-bindings/src/server/fizz-instruction-set/ReactDOMFizzInstructionSetShared.js
index 73d1ccfd8ce4b..89f6c3cafe7ed 100644
--- a/packages/react-dom-bindings/src/server/fizz-instruction-set/ReactDOMFizzInstructionSetShared.js
+++ b/packages/react-dom-bindings/src/server/fizz-instruction-set/ReactDOMFizzInstructionSetShared.js
@@ -196,7 +196,8 @@ export function listenToFormSubmissionsForReplaying() {
     // javascript: URL placeholder value. So we might not be the first to declare it.
     // We attach it to the form's root node, which is the shared environment context
     // where we preserve sequencing and where we'll pick it up from during hydration.
-    const root = form === document ? form : form.ownerDocument;
+    // If there's no ownerDocument, then this is the document.
+    const root = form.ownerDocument || form;
     (root['$$reactFormReplay'] = root['$$reactFormReplay'] || []).push(
       form,
       submitter,