FOSS gamedev and creative worlds

So I was playing minetest 4.13 on my android tablet (lenovo) with the mods, mobs redo and 3Dtorches enabled.
As the title says, I found a Dungeon in mid air. Also I have problems with random rectangular shaped chunks of gras floating in mid air. I have screenshots but don't know how to post them, I will if someone tells me how. Anyways the seed is 1071287371358619288 and coordinates are 71.3, 23.5, 348.31 (looking north). I think this counts as a bug, hence why i' m posting here.

Floating dungeons and floating slices of dungeons were more common in 0.4.13 stable, now in 0.4.13-dev the slices are removed and the complete unbroken dungeons are usually protruding from the terrain instead of floating.

I'd like to see screenshots of the grass bug.
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Thanks for the info on the on the dungeon bug, I'll try to post a screenshot of the grass one here;

Ah that's a dungeon room slice, very common in 0.4.13 stable, now fixed.