Hi,
after days of searching why Twinmotion and Unreal Engine crashes in DX12 mode (memory errors), I finally found the solution here: It is not a software or graphic driver problem, but it was the Intel i9 processor. (mine is i9-14900KF and Nvidia RTX4080)
After updating the BIOS and downgrading the processor Performance Core Ratio of the i9 processor from 57x to 52x (with the Intel Extreme Tuning Utility) everything seems to be working stable now!
Hurray! 
Hope this will help you too 
Cheers, Koen.