V4 RelationManager Class must be declared abstract or implement methods
Class must be declared abstract or implement methods 'getSelectedTableRecordsQuery', 'isTableColumnToggledHidden'
Hi, I don't see on the documentation if I need to declare this methods and how.
Or maybe it's a problem in the upgrade.
The stubs are :
Can you help me ?

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Is it IDE error or does it actually throws an error? Yesterday I was updating multiple projects and I think I saw something similar too, but as I was going on with my update the issue resolved itself, so that's why I thought it might be just IDE reindexing?