How to use PCG to populate a landscape in a level instance

I am trying to build a system, where I have one big partitioned world (level).
In that world i am spawning instanced levels (premade other smaller, non-partitioned levels).
In each of those small levels - I have a landscape and a PCG that populates the landscape with trees, rocks etc.

When running the PCG graphs in the levels themselves - everything works as intended, however, when spawning the level instances in thebig world - the PCG doesn’t seem to work. Namely - the Get landscape data, or World Ray hit Query - doesn’t hit the landscape - I feel like the landscape is not being found.

Volume spawner works correctly - so i know the PCG is being run and that it’s volume and location are correct.

I want to do it this way - because i want to use few premade levels and populate them with different seeds - so they feel like hundreds of different levels.

Is there something fundamentally that I am missing, as I have been banging my head against this issue for a few days, without finding a solution to the problem.

Thank you so much!