For anyone still having a problem, I would suggest again to submit a support ticket.
https://support.advancedcustomfields.com/new-ticket/
Until there is an official fix we will need to use work-a-rounds.
There is the filter I posted above.
You can also figure out how to dequeue the select2 version in the other plugins so that ACF can register it’s version but I cannot give you specific information on how to do this at the moment, because I don’t know.
