'Getting failed assertion with setting brightness: Brightness.dark for darkTheme

I'm getting this error:

'package:flutter/src/material/theme_data.dart': Failed assertion: line 412 pos 12: 'colorScheme?.brightness == null || brightness == null || colorScheme!.brightness == brightness': is not true.

I've used this brightness: Brightness.dark parameter for my dark mode without any problems until a recent update. I updated several things at once, so I'm not sure what caused the change. Do I need to be setting up my dark mode differently now?

Current dark theme:

darkTheme: ThemeData(
           toggleableActiveColor: Colors.blue,
           visualDensity: VisualDensity.adaptivePlatformDensity,
           textTheme: _textTheme(),
           colorScheme: ColorScheme.fromSwatch(primarySwatch: Colors.blue).copyWith(secondary: Colors.blueAccent),
           brightness: Brightness.dark,
         ),

flutter flutter-theme

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'Getting failed assertion with setting brightness: Brightness.dark for darkTheme

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