ios – OS emoji keyboard causes UI freeze in chat TextField Flutter

I have a chat screen where switching to the emoji keyboard on iOS causes the entire UI to freeze. On Android it works perfectly.

My chat screen layout:

Scaffold(
  backgroundColor: AppConstants.offWhite,
  extendBodyBehindAppBar: true,
  appBar: IndividualChatAppBar(...),
  body: SafeArea(
    bottom: false,
    child: Column(
      children: [
        Expanded(
          child: BlocBuilder(
            builder: (context, state) {
              // messages list
            },
          ),
        ),
        BlocBuilder(
          builder: (context, state) {
            return MessageInputField(...);
          },
        ),
        SizedBox(height: MediaQuery.of(context).padding.bottom + 8),
      ],
    ),
  ),
)

My TextField inside MessageInputField:

TextField(
  controller: _controller,
  maxLines: null,
  textCapitalization: TextCapitalization.sentences,
  keyboardType: TextInputType.multiline,
  scrollPadding: EdgeInsets.zero,
  autocorrect: false,
  enableSuggestions: false,
  style: const TextStyle(fontSize: 15, color: Colors.black87),
  decoration: InputDecoration(...),
)

Things I’ve tried (all reverted because they didn’t fix it):

1. resizeToAvoidBottomInset: false + manual MediaQuery.viewInsets.bottom padding via SizedBox

2. WidgetsBindingObserver + didChangeMetrics() with 80ms debounce to track keyboard height

3. Wrapping input in SingleChildScrollView(physics: NeverScrollableScrollPhysics())

4. Isolating the input into a separate StatefulWidget to limit MediaQuery rebuilds

5. SingleChildScrollView(reverse: true) with Padding(bottom: viewInsets.bottom) wrapping the input

6. keyboardType: TextInputType.text — this actually broke Android multiline input so had to revert

Question:

Is this a known Flutter engine bug on iOS? Is there any workaround that actually works for a chat layout with a sticky input at the bottom?