Describe the bug
Spawner get cleared and a lot of spam in console

To Reproduce
Steps to reproduce the behavior:

1. Go to the nether, find a blaze spawner and mine it with silk touch

2. you get the actual spawner twice, an empty and one with 'minecraft:blaze'

3. place it in the overworld,

• a. place a lever on it and flick it on. now the spawner contains 'Area Effect Cloud'
• b. apply any other item, such as sugar, clock or fermented spider egg. the spawner contains 'Area Effect Cloud'

5. the console get spammed with logs (see Logs/crashlogs/etc)

Logs/crashlogs/etc
https://pastebin.com/q6caiixN

Expected behavior

Screenshots
none

Minecraft enviroment (please complete the following information):

• OS: windows (client) / Linux (Server)
• Ram allocated pc: 8gb, server: 8gb
• Minecraft & Forge version: 1.15.1 - 30.0.36
• Mod Version: v1.4.4

Additional context

Thanks for the report. I've looked into the issue and couldn't reproduce your bug. Do you have any other mods which may interfere? I found another bug where Server would generate errors when right click on Spawner Block.

Could you try again with this new file: https://www.curseforge.com/minecraft/mc-mods/enhanced-mob-spawners/files/2861037