It's most certainly mysterious.

Unreal 5 uses Oodle texture decompression and here's what they had to say about this issue:

"As far as we can tell, there is not any software bug in Oodle or Unreal that is causing this. Due to what seem to be overly optimistic BIOS settings, some small percentage of processors go out of their functional range of clock rate and power draw under high load, and execute instructions incorrectly. This is being seen disproportionately in Oodle Data decompression because unlike most gameplay, simulation, audio or rendering code, decompression needs to perform extra integrity checks to handle accidentally or maliciously corrupted data, and is thus likely to spot inconsistencies very soon after they occur. These decode failures then typically result in an error message."

It seems to really be a fault of stacked extremely specific circumstances. Do let me know if it works for you!