Affects Version/s: Minecraft 1.12.2
Fix Version/s: None
Environment:Be in a Debug world
How to activate:
1 - Be in a Debug world
2 - Trigger the wooden pressure plate with anything
Result: Spawns hundreds of items into the game, which then triggers itself hundreds of times, etc.
This made me need to restart my game to get out of the situation. I recorded it in action too:
Note that I think the items despawned after I restarted and rejoined.