Steps to Reproduce

1. Create a TextFormField with initialValue = _var
2. In the initState() of the StatefulWidget it is in set the _var async and call setState()
3. The TextFormField is not filled with the _var

Note: it works fine with when the _var is set sync instead of async.

Workaround for now

Use a TextEditingController() and set it's text attribute in the async callback rather than setting the initialValue attached to a key in the state.