Incorrect block lighting

[Yeregorix]

I've been experiencing block lighting issues for few weeks on my servers. The issue frequently appears or disappears on block place or break. I tried with and without async light, same problem. Here is a screenshot using latest SpongeVanilla RC. On this screenshot, all the dark parts appeared simultanously after placing a single block.

Edit: I did few other tests and I can reproduce the issue with the same world but with a vanilla server and a vanilla client. So either something (sponge or something else) left traces on my maps or either I'm just getting crazy.