Alchemist button styling issue

reproducible_test.dart

import 'package:alchemist/alchemist.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

final theme = ThemeData(
  // In this configuration, the bug occurs.
  //
  // It does not occur if:
  // - no textButtonTheme is provided
  // - the provided TextButtonThemeData is empty
  // - the TextButton.styleFrom call is called with no textStyle argument
  // - a fontFamily is provided to the TextStyle, such as Roboto
  //
  // Creating an empty TextStyle and providing it as done below causes the bug.
  textButtonTheme: TextButtonThemeData(
    style: TextButton.styleFrom(
      textStyle: const TextStyle(
          // fontFamily: 'Roboto',
          ),
    ),
  ),
);

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('TextButton', () {
    AlchemistConfig.runWithConfig(
      config: AlchemistConfig(
        ciGoldensConfig: const CiGoldensConfig(enabled: false),
        platformGoldensConfig: PlatformGoldensConfig(
          theme: theme,
        ),
      ),
      run: () {
        goldenTest(
          'renders correctly',
          fileName: 'text_button',
          builder: () {
            return Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                Builder(
                  builder: (context) {
                    print(
                      'style for text: '
                      '${DefaultTextStyle.of(context).style}',
                    );
                    return const Text('Regular Text');
                  },
                ),
                TextButton(
                  onPressed: () {},
                  child: Builder(
                    builder: (context) {
                      print(
                        'style for button: '
                        '${DefaultTextStyle.of(context).style}',
                      );
                      return const Text('Button Text');
                    },
                  ),
                ),
              ],
            );
          },
        );
      },
    );
  });
}