I put zombiefied Piglin inside the spawner

As you see one just spawned not far from the spawner

so spawner is working but it is empty the zombiefied piglin doesn't render

It doesn't render in my spigot/paper server

also it doesn't render in single player with no datapacks/resource packs

The single player world was created in 1.16.1

 This also affects bees,,enderman,