Bukkit

What steps will reproduce the problem?
1. Take item in your hand.
2. Place an item inside regios region (creeper head was the duped item on our server)
3. The item will be placed but instantly broken as soon as regios detects it, rather than cancelling the event. That leads to having the same item two times. One in your inventory and one as a broken entity.

What is the expected output? What do you see instead?
The expected output: A cancelled event. What I see instead: massive amounts of creeper heads, it might work as well with diamond blocks or other blocks (not confirmed) //Update: It seems to be an entity problem

What version of the product are you using?
5.9.0

Do you have an error log of what happened?
Nope

Please provide any additional information below.
That's it. I haven't seen any fix of the bug in the changelog of newer versions. So I assume its not fixed yet.

What protections do you have enabled on the region? I just tested it out with just block place protection on and didn't experience the same issue you did.

@johnnyzerox7: Go

I cant give you the exact protection because I am only dev on the server but it seems to be an entity problem.

@thoosequa: Go

Could you give me a list of the other plugins then? I've tested for this on a couple different servers now, but I have yet to have the same issue you're having. I'm thinking maybe its interference by another plugin.