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No signal, blank screen during startup of macOS Catalina

HP Recommended
HP Envy 34c
macOS 10.15 Catalina

Since macOS Catalina my HP Envy 34c is not working correctly. It doesn't show anything when my Mac mini 2018 is switched on.


I have to press the on/off button to hear this voice saying: "username", then "password". After filling in my credentials my display is working fine.


Recently (1 day ago) I have installed update 10.15.5 (with second patch). Now my display is totally not working anymore. It only awakes if I disconnect the TB3 cable from my display and you can see my display working when the cable is connected again.


Is there any fix available?


It's so frustrating. 

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