Hello! A bug from the past is back... I do not know how I got rid of him then but his cause I have not revealed.
Here's what... mobs in some work as it should, to be precise - spawn correctly. But then they get smaller and smaller until they stop spawning. To be more precise they are a couple of groups to spawn near the portal to the world where they live, but more can not find them. I have already written about this bug but the solution has not been found.
The mobs themselves are monsters, the world in which to spawn - day, but before they spawn, this did not prevent, normal animals will always spawn as it should, but if you change a monster on the animal, too, is changing as much as nothing. The difficulty is normal, tried to change - nothing. Cleaning the computer , nothing. Changed settings spawn - nothing. Deleted and created again - nothing + related mods give errors. There's only one biome in the world. Twisted settings and a biome and measurements - there is nothing, especially I changed nothing before and everything was normal. As a result, the bug was corrected in some unclear way, or I did something that I do not know, or something reconfigured itself. I don't know, but I can't fix this right now.
bug was in 1.8.1 - https://mcreator.net/tracker/issue/45570 (the bug has the same features written before but not voiced here)
p.s Yandex Translate