Streaming levels loses static meshes coordinates and mesh references when a Blueprint within the sub-levels are changed and they aren't toggled visible in the Persistent Level when it is being built. Selecting "Yes All" to make the levels visible and builds them, but still invalidates the assets. Opening the Persistent Level and then toggling the sub-levels sometimes restores them but not all the time.
This was reported and tested in 4.22.2 (CL-6574378). This was reproduced in 4.21.2 (CL-4753647) and Main 4.23 (CL-6651710)
Results: Child levels loses all static meshes and their coordinates. Some levels become invalidated.
Expected: Child levels are not losing their content.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-75254 in the post.