Empty but functional mob spawner

I saw the duplicate, and instructions had been left to either make a comment on it to expand the issue or to create a new bug. I opted to create a new bug to more easily include my system information.

Multiple spawners in this realm are functional, but the mob icon inside the spawner is missing; ie, the spawner makes the mobs as appropriate but the icon is not in the spawner. This is occurring on Realms. For example, a skeleton spawner may be found at the following:

Seed: 367054049

Coordinates: 2256, 55, -334

This issue is not isolated to only this example. This occurs at many locations.

Please let me know if you need additional information. Thanks.