[Flutter | Web] BeagleAction won't be parsed after a navigation sometimes

[Tiagoperes]

Sometimes, a BeagleAction is not parsed after a navigation.

To reproduce:

1. Run the beagle backend sample
2. Run the Flutter sample project
3. Enter the Text example and leave it many times. Some times, the screen will be rendered with the text "Error", and the console will print:
   Could not build component beagle:screenComponent with id _beagle_83 due to the following error: [BeagleSDK] type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Function'

I don't know if this error is in Flutter or Web Core.