_Neon10_

This also happened on my private vanilla 1.17.1 server. Three bees disappeared from a fully enclosed farm (so the bees couldn't get away in case they went through the glass) located in spawn chunks. In my farm I used a bee nest, not a beehive. I should add that three bees that were in a naturally generated bee nest in a birch tree (tree grown with bone meal) also disappeared, so I don't think the problem is limited only to the farms, although in this case there is a possibility that they flew away. In my case, too, I noticed the event after being away from the base for a fairly long period of time, just as it happened to Stephanie and Tyler.
 

Same problem here. I’m unable to connect to home server since it was updated to 1.12.2. No problem with 1.12.1. Same problem with last snapshot (17w47b). I believe (as @paul williams said) that the problem is the change in Minecraft server protocol in 1.12.2 [Changed parameters in Keep Alive (clientbound - 0x1F) and Keep Alive (serverbound - 0x0B) from VarInts to longs.]. I think that in some particular circumstances (bad internet connection for example) this change in Keep Alive protocol causes disconnection. It’s a big annoying problem, since I can’t play online anymore with last stable release. Sorry for my bad english.