Dear Mojang,

Ever since the launch of 1.15 we've been noticing bees disappearing.
On 1.15.2 we noticed that they weren't despawning, but rather relocating whenever nobody was at our spawn town. They seem to have accumulated to large numbers since we kept spawning them (because we taught they despawned)
We've never been able to catch them in the act, but they seem to relocate in the unloaded areas North/West of the area they were summoned at.

The bees were spawned in an area with lots of flowers and sufficient beehives and bee nests (which they recognize and enter/leave).
The same seems to happen with tropical fish, they get summoned at the coast of our town but end up in the swamp biome after a while (even when kept in an aquarium).

The same behavior does not seem to occur with other mobs (not reported by playerbase).

Expected behavior:
Bees stay near their beehive or bee nests (with a radius).

Current behavior:
Free Roaming bees migrate to unloaded chunks and get lost. They don't return to their hives.