FOSS gamedev and creative worlds

I've been running a small test map and regularly run into "dark patches" in an area I use for growing trees.
I didn't pay any attention to it until user Issue2035 mentioned on IRC how he could not reproduce the bug in the git version.

I attached a screenshot, there's nothing in the sky above that would cause this shadow.

The map can be found here.

Having that problem on 0.4.13-64a5eec on Extreme Survival Minetest.

Fixerol wrote:Having that problem on 0.4.13-64a5eec on Extreme Survival Minetest.

On ESM type /mapfix and it fill fix the area ;-)

I know, but it is still a bug.

Fixerol wrote:I know, but it is still a bug.

Yes. My bad.

Is a known long-term bug, sapling growth uses 'place schematic' which uses a lighting update that is known to cause shadow bugs.
Growing many saplings rapidly increases the chance of shadows.