Bees seem to wander off pre 1.15 generated chunks for me.
After googling a ton of different keywords and phrases, I took it upon myself to check the NBT tags of the chunk the errors were located in. In the chunk, under the "TileTicks" data values, any entry's data "t" was cleared and the issue was resolved.
@Kumasasa it is most certainly a bug with minecraft, and if Apple knew what the problem or how to fix it, they couldnt because its Mojangs Game. Not theirs.
I also and using OS X Yosemite beta 4 and This is happening to me. Hope this gets fixed because I love playing minecraft and I would love to keep beta testing but If they won't fix I must revert to Mavericks
I logged into 1.17.1 and it was creating the exact same issue, maybe you guys didn't have a big enough wall of ice behind glass?