Hey there, you are not alone, I have been dealing with the same error.
The crash report does not allow me to understand what actor is responsible for the crash, but it is always happening on my final boss fight.
So there is something that clearly triggers this error.
Have you been able to catch what was causing the error on your side?
In 5.7.2, the random crash issue was fixed. However, there is still a GC crash, but that’s a different problem. So if you encounter a crash similar to mine, you can try upgrading to 5.7.2.