Minecraft Username:
Cike25

Brief Description:
Newly placed spawners are borked. Spawners placed before 1.21.6 upgrade still work.

Instructions:
1. Place a spawner in an adequate spawning location

How many times did you recreate this?:
Many times, with old spawners, new spawners, picked up spawners, etc.
Tested placing with 1.20.1, 1.21.6, and 1.21.7 clients.

Result:
The placed spawner does not have the miniature inside and it do not "activate" to spawn mobs.

Expected Result:
Placed spawners has the appropriate miniature inside and spawns mobs.

Evidence:


As shown in the 3rd screenshot, there seems to be some data missing from the newly placed spawners. Log block does not indicate the spawner type.

 

Placing spawners is working as expected now! Thanks!