Terrain Heightmap 4K resolution is not working Unity 6000.13f1

hey, no matter which terrain size I test, the 4K resolution for the heightmap is not working, it goes to loading “HOLD ON” for 20 minutes and nothing happens, memory usage is stuck at a certain amount and the only way is to close unity via task manager. Unity 6000.13f1.

4500 * 4500 M same result,
50 * 50 M same result.

I’m sure the issue is only happening in unity 6. in unity 2022 it just changes very fast without any loading.