Editor crashes upon opening levels (not always)

Development World Creation
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1

Any map is sometimes loaded successfully, but mostly causes crash.
Everything used to be fine in the project since like 4.9 or so until 4.18 (and still in 4.20)
I used to load much larger levels with lots of references, but now i mostly crash, even if trying to open an empty level.

Log attached.

Thanks.

2

bumpy bumpy please

3

I am experiencing the same thing.

I updated from 4.19 to 4.21, and it’s a C++ project. Trying to open a level, it crashes. I reverted back to 4.19 then updated to 4.20, made needed changes and tested that it worked. It did, can open levels.

Then updated to 4.21 again, same problem. Levels crash on load.