World Partition tiles wont unload on bigger maps

Hello, i`ve tried multiple tutorials on world partition but i always have the same problem.
After enabeling world partition and building the hlods (suggestions from forum discussions about world partition fixes) i cant unload even one tile. It simply wont react and if im in the world partition window and zoom to the 10km mark it dramaticly slows down.

I´ve tried starting with an empty open world project and converting an existing project.

I tired multiple landsapce sizes. 1009*1009 in 7 tiles, 2017 in 4 tiles , an untiled 8129 and even an small 2017 untiled build, always the same problem.
Sometimes i cant even use the same heightmaps to paint diffrent layers altough there all from the same gaea build (works in an normal world).

It should be usable since others create 100km² maps and worked with it or did they messed up an update?

If yes are there any work arounds to create big maps without an high-end gpu?

Thanks for any suggestions.

Edit
The problem where i couldnt use heigtmaps to paint is resolved i exported them to png instead of raw and it worked again.