Petr Grolmus

And how do I "erase cache data" in java edition? 

Yep, definitely not resolved. In 1.14-pre3 the darkness is gone - that really fine, but... In those previously dark chunks mobs are generating even in the full sunshine and zombies, skeletons and drowned do not burn. Spiders attack during the day. Mobs generate next to torches, so the lightning problems continues 😞
See