If you try to map tab to be used as another key it still triggers the menu. As i can remember this was a problem on the earlier steam version, i don't know why it exists in the GoG Build.

You are right, it does not work for me as well and as you can see here:
https://steamcommunity.com/app/427290/discussions/0/1697174779866742337/
(Notice that they mention a workaround for it as well)
It was a known problem on Steam. However I could not find any post on Steam that confirms that they have fixed the issue there. Do you have a link for this?