Rebuilding lighting with commandlet will move hidden sublevels
Confirmed in 4.23 MAIN @ CL 5194133
Result: Reopen project and see that sublevel SLB_Sec4_Geo has moved. (Back to 0,0,0), running commandlet again will move level farther.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-70637 in the post.