SongOfDeath

I can confirm on private worlds this also happens.

there can be at most one discount on a villager (not counting hero of the village)

I found a temporary fix in a creative world... i destroyed the end-gateway in creative, and then re-spawned the dragon 20+ times (it eventually cycled back around and rebuilt that gateway, and it worked! However a bunch of testing and it broke again... not sure what caused it yet... and respawning 20+ dragons  is tedious even in creative.

I do see that in the video…

but we didn’t have “keep inventory on” (that’s how he lost the items in the first place).

and shortly after this I had mined into the netherrack looking for items that clipped through the floor/walls. 
we reset the realm anyhow so he is good, but I’m not sure where the items went.

either they went into the ceiling or fell through a bunch of blocks.

thanks for your help.

Note to everyone here who says it isn’t working. 
it seems to me that wither akeletons don’t spawn in-between glass panes if there is a wither rose.

it’s either: glass panes around the spot 

or

wither rose on the spot.

Not both.  

If you used glass panes to find the spawn spots. You must remove them when you put down the roses.

As i mentioned on https://bugs.mojang.com/browse/REALMS-10852 (marked as a duplicate)

We got this to happen again on the same realm that had it happen before with a new gateway (teleported to 0,0,0).

It happened right after 2 users tried to use the same gateway at the same time (both from the main island, one used an ender-pearl, the other went into swim mode via water).

One user was teleported to 0,0,0, and the other user was kicked back to be on top of the main-island gateway.

The gateway stopped working (it was working successfully multiple times before this). It repeatedly takes anyone who uses it to 0,0,0. 

Edit:

We ended up rolling back the realm this time, and it works again.... but the steps above seem to cause it to happen

Confirmed it effects 1.19.20

Shouldn’t the game prevent people from spawning in things like this?

we need the ability to (without cheats) prevent/disable/etc other users from modifying the world in this way. 

Yes I’m sure.

I’m in creative. If I place the saplings at y=-1 it won’t grow with multiple stacks of bonemeal.

if I put dirt above those very saplings and put 4 more saplings on top of that (y=1) then they grow into a full tree with just a handful of bonemeal.

even though there is technically*less*room for those higher saplings (closer to a cave roof by 2 blocks)

both groups have the same distance in X/Z from the nearest wall.

I'm having this same issue on a realm. Mobs are not spawning from spawner at all.

Steps to Reproduce:
1. Be near a working spawner (on a realm) 
2. go into a nearby portal to nether. (Note that traveling 100s of blocks in the overworld doesn't seem to cause an issue)
3. return to overworld near spawner.
4. spawner stops spawning mobs.

Observed Results:

Light levels are 0,
There is a 7x7x7 space around the mob spawner
I am within 10 blocks.
The mob inside just spins but doesn't spawn a mob (waiting 30+ min)  

Expected Results:

When light level is 0 and within range of spawner, expected mobs of the type inside the spawner to appear within a few minuets. 

I'm having this same issue on a realm. Mobs are not spawning from spawner at all.

Steps to Reproduce:
1. Be near a working spawner (on a realm) 
2. go into a nearby portal to nether. (Note that traveling 100s of blocks in the overworld doesn't seem to cause an issue)
3. return to overworld near spawner.
4. spawner stops spawning mobs.

Observed Results:

Light levels are 0,
There is a 7x7x7 space around the mob spawner
I am within 10 blocks.
The mob inside just spins but doesn't spawn a mob (waiting 30+ min)  

Expected Results:

When light level is 0 and within range of spawner, expected mobs of the type inside the spawner to appear within a few minuets. 

I was hoping it would be fixed in the 1.16.220 update that just happened... apparently not.

I agree the target block is basically useless for redstone without this fix.