My world won't update when trying to import scenery

[GryphonKingBros 2]

I'm trying to import things from my world to use in my project, but they aren't appearing. The objects I built previously on this world are still available and can be imported but the new stuff won't render into the import screen. I have the same issue when trying to use Mineways, but I was trying to import the world into Mineimator so it seemed appropriate to start here.

This is what is visible from the import screen:

And this is what is in the game:

Here's a copy of the world too if that helps. Any suggestions on how to fix this?

[MojangYang 918]

sure you saved your world?

[GryphonKingBros 2]

17 hours ago, MojangYang said:

sure you saved your world?

Yes I saved it several times, reloaded the game several times, nothing worked.