AppFormAsynchResize not triggered

[Lenfors]

Very confused about this error and in what version it starts.
Se my upgrade history below.
Seems like as soon as version 15.3.10 or 15.3.11 is applied I have to downgrade to version 15.3.9 or lower to get it working again!?

Started with 15.3.7 Woks fine
Upgrade to 15.3.12 Not working

Reinstalled 15.3.7 Works fine again
Upgrade to 15.3.11 Not working
Downgrade to 15.3.8 Works fine
Upgrade to 15.3.9 Works fine
Upgrade to 15.3.10 Works fine
Upgrade to 15.3.11 Not working
Downgrade to 15.3.10 Not working
Downgrade to 15.3.9 Works fine
Upgrade to 15.3.11 Woks fine