Describe the bug
this is a random glitch that has been occurring, and I primarily notice it when my family up and vanishes. ill be playing and i check my whistle, but a family member is completely gone from it, even when reloging the game. i have no death letter about them, and when checking the family tree, they're still alive. I used the villager tracker and go to their last known location, but they never move from that spot, are not even there or registering as any entity, and are just gone entirely. I checked with spectator mode, and they're just not there. i had to go into my own mca editor to divorce my wife by removing her name after she vanished, since i can't exactly hand a missing entity divorce papers or use the separate command on a villager since it didnt allow me to. now, one of my adult children vanished too. once theyre gone from the whistle, its now a lost cause.

To Reproduce
its a random glitch, so it can't exactly be recreated, though what i can say about the two who are now gone, they had been my in game family members the longest, id say they've been around for 18 gameplay hours. upon using the command /tp @p @e[limit=1,name=xxx] it would teleport me to any villager, except for those who have vanished, i would instead receive an 'entity not found' message in chat.

Version
I am playing the June 14th Forge 1.19.2 version, though i have experienced this glitch in the past in other versions as well, but this has become more prevalent now. it has also occurred on 1.16.5 versions

Latest.log
it does not crash the game, so there is no log

two more have vanished, two i just had spawned in three hours ago. are the villagers somehow despawning?

Same problem

I have the same problem, I have some that have died without realizing it. the funny thing is that the blue print tell me that my village is populated and that I have 35 villagers but I only have 6, my wife has also disappeared several times, but I can bring her with the whistle, I also tried like you, to use commands but I got the same error, it is a little frustrating to see that my villagers disappear out of nowhere, I do not know if it is because of an incompatibility with the mods I use (I play in version 1.20.1).

(the pink squares are texture errors in the mod, but they are my villagers.)