Buggy air bubbles in bottom of flooded caverns.

[o11c]

seed = 10986413373913844750 near (-128, -1411, -40), facing south under the ledge, but I have not attempted to reproduce.

If you try to place something in one, the normal liquid logic starts (flowing, then filling in).

I think the first one was 3x1x1, and there's a separate 1x1 still there.

[FaceDeer]

I'll take a look and see if I can spot it when next I resume rummaging through dfcaverns' guts. The "vm:update_liquids()" call in mapgen is supposed to tell Minetest to start testing for flow, but perhaps there's something making air pockets after that call gets made.

[o11c]

After moving around more on that map, there were many more air bubbles - including one 6x6x6 or so. From my reading of the source code, I thought bubbles were only supposed to be at most 2 cells high?

I think that torches mod continuously replaces the node you're in (if it's air) so it "burst" as soon as I swam through the waterwall, and there's no light down there normally.

Note I do have default caves off (because otherwise all the pretty caverns get flooded (with water and lava) too much - oddly, I saw exposed lava under this same sea even now, but it was underwater so it cooled safely), and dynamic liquid disabled for water.

Are we sure about what happens if the game is quit during the tail end of Lua mapgen? I definitely exited a few times (tunneling through water is hard work).