Same here. Looking in event viewer I see this:
Faulting application name: bg3.exe, version: 4.1.169.5932, time stamp: 0x62c4a9d7
Faulting module name: ucrtbase.dll, version: 10.0.19041.789, time stamp: 0x2bd748bf
Exception code: 0xc0000409
Fault offset: 0x000000000007286e
Faulting process id: 0x7494
Faulting application start time: 0x01d8929467390aa1
Faulting application path: C:\Program Files (x86)\Steam\steamapps\common\Baldurs Gate 3\bin\bg3.exe
Faulting module path: C:\WINDOWS\System32\ucrtbase.dll
Report Id: 0887aed7-6eb1-4341-ba6e-7ca9660f456e
Faulting package full name:
Faulting package-relative application ID:
I also attached a debugger to the executable when it crashed and I see a call to terminate inside ucrtbase.dll, which seems to be calling __acrt_getptd, getting null back and then calling abort. abort eventually makes a call _Exit, terminating the program. I don't know the internals of this library but possible trying to get per thread data (__acrt_getptd), fails and exits. Don't have symbols for the BG3 executable so it's harder to see what it is up to.
