I have found really similar bug. Bees ( both with and without pollen) can fly below y = 0 and sit in the void.
I suggest making it impossible for bees to fly below y = 0 by editing bee PathNavigator or AI;
https://bugs.mojang.com/browse/MC-159769?focusedCommentId=578283&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-578283
I have found really similar bug. Bees ( both with and without pollen) can fly below y = 0 and sit in the void.
I suggest making it impossible for bees to fly below y = 0 by editing bee PathNavigator or AI;
[media][media]https://bugs.mojang.com/browse/MC-159769?focusedCommentId=578283&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-578283