In the initial insiders build of the windows 11, some few programs simplely freeze and you can't even kill the process. The steam is a program that don't open if you already have a instance running.
As a workaround this is a small patch that are able to 'remove' the steam anti multiple instances in the same machine.
The patch is made by replacing this 0x74 value to 0xEB in the steam.exe file
I recommend you try patch by yourself finding the patterns around the 0x74 in my screenshot