Hi André,
It is true that we PCG supports only a single PCGWorldActor but we do support “merging” of the Landscape caches when a second PCGWorldActor registers. (APCGWorldActor:MergeFrom)
Looking at the code we are merging the newly streamed in actor into the existing one and if that one eventually gets unloaded then maybe the cache is lost at that point?
If you could craft and share a small repro of your use case, we could check it out and provide more insight and potential fixes.
Cheers,
Patrick