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in addition you need to use ObfuscationReflectionHelper and you need the SRG name of "dimensions" otherwiese it wont work outside of your IDE

You should save this somewhere static, instead of computing it every time. That's not how forge events work. The event doesn't fire to set the size, it fires when the size is changed to allow mods to override it. It is called from the (mojmap) method `Entity#refreshDimensions`, so if you call that method you should restore the entity size. Alternatively, if you don't want to allow other mods to react to the change in size, just recompute the AABB as vanilla does (either setPos, or setBoundingBox(makeBoundingBox())), but I would strongly suggest using the first method.

first of all remove Performant, do not use magic performance mods if the error remains it could be an issue with Oh The Biomes You'll Go

remove two or three mods that add buildings (dungeons, etc.) and then try flying around in a new test world. then two more until the crash disappears. could be village buildings too, but probably dungeons. when you find the culprit, inform the mod author and get a new version.