mobs that don't disappear, can disappear

I was playing Minecraft Last night,then I left the game,in the morning I join my world and one of my villagers It had disappeared, which is strange because due to its tags that should not happen, I left the game later to see if it appeared like that, I re-entered the world, and my other villager also disappeared (I play in Minecraft bedrock beta 1.18.0.25