I experienced this yesterday, 12/14/2021. I am playing on Bedrock Edition version 1.18.2 on an Android Tablet. I create a back-up of my world a couple times a day. Everything disappeared on Tuesday, but I had to go to the back-up I created on Sunday to get everything back. So it seems that something corrupted the world on Sunday, but the effect did not present itself until Tuesday.
I mined a little in the Nether, created a conduit near my base on Sun/Mon. On Tuesday, I went further into the Nether for a while, and then I played on a Cubecraft server to play Skyblock. It automatically downloaded a "packet" or something before I logged in. When I went back to my world, all the animals disappeared. Let me know if you need more info.
As a precaution, you could save and exit the game far away from anything of value.
When the "Armageddon Bug" hit me I lost every living tamed/fenced creature that was near my house. But my village that is about 400-500 blocks away was unharmed. So I created a small outpost that is far away from my house with a couple animals (to see if they disappear). This is where I save and exit the game. I am not sure how far I should make it though. I think there is a 120 block radius that things will not grow, so I would at least go that far. Maybe the bug only affects things within that radius.