Terrain parts computation is not proceeding

Created a map, added a terrain, was taking forever to compute this stuff.
So I let it there.
2 hours later, we are still here.

Oh and if I try to play in Editor, this is what I get, and it’s almost frozen, with the center window continuously popping up, but no progress.

Update: after letting it run for several minutes in PIE, it finally completed the build.

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