Since updating to 19w46a, the bees are trapped in their hives, and the hives produce no honey. New hives work for a while, and then start to fail just like pre-existing hives. Every 30 seconds, during the day, the bees seem to try to pop out, but go right back in. There is also a splash sound, like the hive is producing honey, but it doesn't. I'll attach a screen capture showing the bees piping out and back in:
[media]Shears have no effect on these hives.
Nests don't appear to have this problem, nor do brand new hives (for a while).
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In case it is not obvious, I have campfires under the hives, however I tried removing them, and also removing every other hive, to see if these were factors, but it appears to have no effect.
Probably the same bug, but maybe different... shears have no effect on hives.
Oh, weird... it appears it is not happening with newly created hives, but does still happen on old hives if you collect them with silk touch and put them back.

Even hives created in 19w46a start to fail in this way after a while. Initially, they work as expected, and then start to exhibit this wrong behavior.

Not sure if this matters, but the first day that they start to do this pop in/out thing, they are on a (seemingly) random schedule, but after the first night cycle, they are all synchronized. All of the bees pop out of and back into all of the hives at the same time. They make a big splash sound if you have a lot of hives.
I also have this issue with my bee nest, but it's not a matter of older vs. new bee nests. It happened once I put a campfire under the nest. Issue began as of today, 14 Nov 2019, version 19w46b. Running on Windows 10.
Thank you for your report!
We're actually already tracking this issue in MC-165173, so I resolved and linked this ticket as a duplicate.
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To confirm this issue, I have the same issue on Windows, 19w46a. The issue persists across restarting the game.
Here are some debug files:
[media][media]