Steps:

• run server with the included plugin enabled
• place a dispenser facing into open air with a solid block below the facing block
• put shears inside the dispenser
• activate the dispenser with a redstone pulse

Expected: There should be a message in the console indicating the event was called, and fire should be set in the facing block

Actual: The event is not called, and so there is no console message or fire

Notes: This issue only applies to Spigot/CraftBukkit 1.14, and only to dispensers—droppers work just fine, it's the new vanilla dispenser behavior for shears that's causing this. It also doesn't matter whether or not there is actually a sheep to be sheared in front of the dispenser.

Plugin Source: https://pastebin.com/5Mj6uq43

I don't actually understand step 9 in the report guidelines: 

9. All bugs should include the amount of time you spent on steps 1-8.

I didn't time myself, but I can be a bit slow?