It is far more serious.
I had a project running (almost) fine in 5.4.3 but after update to 5.4.4, Unreal crashes. Even a previous version migrated from 5.3.2 to 5.4.4 has exactly the same problem. It depends on the level and probably the size of the level, the number of assets, nanite/no nanite, PCG’s (both by volume and by spline) …
System is completely up-to-date in drivers and OS.