Games stop working with Proton 6.3-4

Compatibility Report

• Dorfromantik
• Steam AppID of the game: 1455840

and also

• Townscaper
• Steam AppID of the game: 1291340

System Information

• GPU: Intel(R) UHD Graphics 620 (WHL GT2)
• Driver/LLVM version: 3.0 Mesa 20.0.8
• Kernel version: 5.4.0-73-generic
• Link to full system information report as https://gist.github.com/frudolph77/2fdfff10708560b2b4003438d804b22c
• Proton version: 6.3-4

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

Logs of Dorfromantik (1455840):

Log of game with working Proton 6.3-2
steam-1455840_Proton_6.3-2.log.gz

Log of game with broken Proton 6.3-4
steam-1455840_Proton_6.3-4.log.gz

Symptoms

Game simply stops running with Proton 6.3-4, has been running fine with 6.3-3/6.3-2 and 5.13-6

Reproduction

Just switch between Proton 6.3-4 and previous 6.3 Versions
I've had an older steam installation available, on an other box, and took the Proton Version from there to verify that the game runs fine with older versions.
I think there is a problem with the wine update on May, 13th

Start by comparing the attached Dorfromantik logs for Proton 6.3-2 and 6.3-4, then review the reported regression against the Proton 6.3-4 change. Use the Proton version switch and the two listed games to reproduce it; done means both games launch successfully with Proton 6.3-4.