Auth0 login with redirect internal error with custom template

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The error that I get on the Flutter side in console:

══╡ EXCEPTION CAUGHT BY FLUTTER FRAMEWORK ╞═════════════════════════════════════════════════════════
js_primitives.dart:30 The following UnhandledActionError was thrown:
js_primitives.dart:30 server_error: Internal error
js_primitives.dart:30 
js_primitives.dart:30 When the exception was thrown, this was the stack:
js_primitives.dart:30 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 297:3  throw_
js_primitives.dart:30 packages/auth0_flutter/src/web/auth0_flutter_plugin_real.dart 41:9           initialize
js_primitives.dart:30 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 60:31           <fn>
js_primitives.dart:30 dart-sdk/lib/async/zone.dart 1423:47                                         _rootRunBinary
js_primitives.dart:30 dart-sdk/lib/async/zone.dart 1315:19                                         runBinary
js_primitives.dart:30 dart-sdk/lib/async/future_impl.dart 177:22                                   handleError
js_primitives.dart:30 dart-sdk/lib/async/future_impl.dart 850:46                                   handleError
js_primitives.dart:30 dart-sdk/lib/async/future_impl.dart 871:13                                   _propagateToListeners
js_primitives.dart:30 dart-sdk/lib/async/future_impl.dart 651:5                                    [_completeError]
js_primitives.dart:30 dart-sdk/lib/async/future_impl.dart 737:7                                    <fn>
js_primitives.dart:30 dart-sdk/lib/async/zone.dart 1399:13                                         _rootRun
js_primitives.dart:30 dart-sdk/lib/async/zone.dart 1301:19                                         run
js_primitives.dart:30 dart-sdk/lib/async/zone.dart 1209:7                                          runGuarded
js_primitives.dart:30 dart-sdk/lib/async/zone.dart 1249:23                                         callback
js_primitives.dart:30 dart-sdk/lib/async/schedule_microtask.dart 40:11                             _microtaskLoop
js_primitives.dart:30 dart-sdk/lib/async/schedule_microtask.dart 49:5                              _startMicrotaskLoop
js_primitives.dart:30 dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 181:7           <fn>
js_primitives.dart:30 ════════════════════════════════════════════════════════════════════════════════════════════════════

and a corresponding Dart error:

WebException (server_error: Internal error)
  code: "server_error"
  details: Map (2 items)
    0: "state" -> "UEhPUDVOVDZ2SWFIbGpOaExnUzdTdmhiWTV4NS55LUpLMDdwZmRTQ0pqQw=="
    1: "appState" -> null
  hashCode: 261623223
  message: "Internal error"
  runtimeType: Type (WebException)