Level Instances are not included in the World Partition minimap as their load requests do not get processed.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-149036 in the post.
|Component||UE - World Creation - Worldbuilding Tools - Level Instances|
|Created||Apr 13, 2022|
|Resolved||Jun 10, 2022|
|Updated||Jun 10, 2022|