Bees seem to wander off pre 1.15 generated chunks for me.
@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?