After upgrading to 5.5, when playing the game I would see HLOD are out of date rebuild them. So I selected that option, but when I do Unreal Engine crashes. I send the crash report to them. I hope they fix the problem. I am going to revert back to 5.4.
I created a forum thread: https://forums.unrealengine.com/t/after-upgrading-to-unreal-engine-5-5-i-get-a-crash-when-rebuilding-hlod/2132147
Update: I was able to search for that file that was corrupted or whatever, and delete it from the level. Now HLOD is able to build.