Minimal bandaid: take the CredMan early-return BEFORE mutating any
session_state_-> fields. This keeps current_field / last_queried_field_rfh_id
consistent with session_state_->{form,manager} when the call is dropped.

--- a/components/android_autofill/browser/android_autofill_provider.cc
+++ b/components/android_autofill/browser/android_autofill_provider.cc
@@ -196,6 +196,12 @@ void AndroidAutofillProvider::OnAskForValuesToFill(
   // StartNewSession is called when the form is focused or the field value is
   // changed, and we need to set the current_field and last_queried_field_rfh_id
   // before StartNewSession is called.
+  if (credman_sheet_status_ == CredManBottomSheetLifecycle::kIsShowing) {
+    // CredMan prevents 3P autofill UI. Do NOT touch session_state_ here:
+    // overwriting current_field/last_queried_field_rfh_id without also
+    // updating form/manager desyncs triggered_origin for an in-flight fill.
+    return;
+  }
   if (!session_state_) {
     session_state_.emplace();
   }
@@ -210,10 +216,6 @@ void AndroidAutofillProvider::OnAskForValuesToFill(

   UpdateCurrentField(manager, form, field);

-  if (credman_sheet_status_ == CredManBottomSheetLifecycle::kIsShowing) {
-    return;  // CredMan prevents 3P autofill UI. Start the session on refocus!
-  }
-
   // Focus or field value change will also trigger the query, so it should be
   // ignored if the form is same.
   if (!IsLinkedForm(form)) {