FOSS gamedev and creative worlds

Well, last night I was playtesting a bit in minetest_game and ran into this:

That is a SOURCE lava node, just sitting there on top of a stone node and not flowing at all.
Of course, I couldn't resist digging out the node beneath it, and at that point if flowed all over the place just like normal.

So, I figured one small flow glitch and ignored it. BUT, after some more digging, I opened up another lava cave, and ran into this:


I'm going to go out on the limb and guess that this is a BUG. :)

installed:
minetest_201405112051-0~2747~ubuntu12.04.1_i386.deb

So its a fairly recent version. No map generation mods of any kind installed.

20140511

1) Update.
2) Default minetest_game?
3) mapgen version?

updated to minetest_201406020414-0~2778~ubuntu12.04.1_i386.deb
But of course, this pit was generated under the other version. But no change when I visited using the newest version.

minetest_game with mods: boats bridgetool carts compassgps elevator explorertools inventory_plus lantern trash_can zcg

map gen v6