Yeah in theory it should be to able to cook without fully re-importing everything. Probably a setting/subsequent change the tutorial didn’t cover.
Also, I’m not fully up to speed with regards to UE5 integration with houdini. world comp vs partition introduced some lower-level changes to everything even if you aren’t using those systems in your level.
Maybe some hints in here, it covers some of the changes introduced with ue5:
https://www.sidefx.com/docs/houdini/unreal/landscapes.html
I might have more ideas to add but I think I broke a bone in my foot today, will be able to think more clearly once it calms down a little.