This is Happening In 1.19.2
Never happened to me before 1.19
For me it only happens when i switch the button size to higher than 90(im on a iphone 6 btw). This is still very pitiful of mojang, minecraft deserves better than this.
Happened to me several times since 1.16, i suggest regular saves of your world every time u enter or leave it until mojang fixes it.
I saw it happening on the latest preview also
This problem is not exclusive to realms, i have a zombie spawner farm and i cure the zombie villagers to create a villager trading post under my base at y15. When i leave my base or go over ground, i always deactivate the spawner and have placed carpet all around it to so nothing spawns yet when i come back to my base all the villagers and player interacted mobs including a tamed fox and a red coloured sheep disappear with no sign of them existing besides the emeralds i traded with them. The confusing thing is that i have a villager (with mending) a hundred or so blocks away from my base, yet he has not despawned. This has now happened 5 separate times in the span of two days, to the point where im just fed up.
This also happens after a crash which for some reason has become common after the recent 1.16 patch. Also im playing on ios. Has also happened with with blocks like slime and items like warped fungus on a stick
If u add glow inc sack to coloured sign in latest beta, it will be bright like the old one.
I believe this is mojang's plan for this issue, so wait a few more months for 1.17 to drop
This has still not been fixed
It Still Happens In 1.19.2