I am having the same issue, just made a thread about it, but Ill add it to here too.
This started proceeding the 9/26, Mirage Update Patch. The game will unexpectedly freeze and crash when I use Haze's Bullet Dance Ult in certain situations. Specifically, I noticed this when performing the ULT in close proximity to Paradox's reflection wall, and also directly proceeding another character's ult, if you're within close proximity to them.
The game unexpectedly closes, and checking task manager, the memory usage on my computer spikes to 99%.
Already tried deleting the download cache and uninstall/reinstalling the game. As well as downloading the most up to date chipset and graphic card drivers.
AMD Ryzen 7 7800X3D and RTX 4070 Super, 32GB of RAM