FormBuilderDateTimePicker calendar not disposing properly and crashing

[MattConflitti]

Environment

Package version: 7.8.0

Flutter doctor

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Code sample

FormBuilder(
  key: _formKey,
  child: FormBuilderDateTimePicker(
      inputType: InputType.date,
      decoration: const InputDecoration(
        labelText: 'Start Date',
        labelStyle: TextStyle(fontSize: 20),
        filled: true,
        fillColor: Colors.white,
      ),
      maxLines: 1,
      autocorrect: false,
      name: 'start_date',
      initialValue: DateTime.now(),
      style: const TextStyle(fontSize: 25),
      onChanged: (value) {},
      valueTransformer: (value) => value.toString(),
      // controller: nameTextFieldController,
    ),
)

Description

Expected behavior:
Should be able to update the date when hitting okay

Current behavior:
Throws an error related to dispose and setState

Steps to reproduce

1. Click on field to change the date.
2. Change date
3. Tap okay

Debugger highlights this code from the _FormBuilderDateTimePickerState

  @override
  void dispose() {
    effectiveFocusNode.removeListener(_handleFocus);
    // Dispose the _textFieldController when initState created it
    if (null == widget.controller) {
      _textFieldController.dispose();
    }
    super.dispose();
  }

  Future<void> _handleFocus() async {
    if (effectiveFocusNode.hasFocus && enabled) {
      effectiveFocusNode.unfocus();
      await onShowPicker(context, value); // <<<----- HERE
    }
  }

Stacktrace/Logcat

This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callback.
The preferred solution is to cancel the timer or stop listening to the animation in the dispose() callback. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree.
This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose().

#0      State.setState.<anonymous closure>
package:flutter/…/widgets/framework.dart:1097
#1      State.setState
package:flutter/…/widgets/framework.dart:1132
#2      FormFieldState.didChange
package:flutter/…/widgets/form.dart:459
#3      FormBuilderFieldState.didChange
package:flutter_form_builder/src/form_builder_field.dart:201
#4      _FormBuilderDateTimePickerState.didChange
package:flutter_form_builder/…/fields/form_builder_date_time_picker.dart:388
#5      _FormBuilderDateTimePickerState.onShowPicker
package:flutter_form_builder/…/fields/form_builder_date_time_picker.dart:312
<asynchronous suspension>
#6      _FormBuilderDateTimePickerState._handleFocus
package:flutter_form_builder/…/fields/form_builder_date_time_picker.dart:271
<asynchronous suspension>```

[MattConflitti]

@deandreamatias Thanks for taking this up. Any ideas on what may be causing this issue?