Villagers disappearing in job-full, walled village??

I spawned near a village of 9 houses with 2 golems, and I expanded it to have 23 beds and 22 job site blocks. I had also put torches every 3 blocks, removed all the irregular holes in the ground and walled the village in 3-block high walls to prevent any hostile mobs from incoming. There are no gates in this fort.

For the more-than-a-month that I spent on the world, the villagers bred, and everything was fine. *But one day, when I logged into my world, *there was all but 6 villagers. In shock,* I added 8 more job site blocks and 10 more beds near the village centre* (with two bells), yet the villagers (who were unemployed, NOT nitwits) would not take any profession.

In a few day-and-night cycles, the number has dropped all the way to 1. The golems are still around, but all the villagers that I have traded who went up to journeyman or master level, are now all gone.

What I found was a disappearing-villager bug that people reported on Java 1.14, yet I was on the Windows 10 version, which led me to ask if this would be a bug.