Is there a way to turn blocks into dirt when they are placed?

There is this glitch on a modded server where when you put a conveyor belt on a certain item it can dupe.

Is there a plugin that makes it so when you place the conveyor belt on another the block it will turn to dirt or a different material?

 

@Michiman You'll have to report this to the mod developer, I don't think we can help you.

 

Well we can fix the glitch we just need to make it so when the conveyor belt is placed on top then the block will turn to dirt. I think it could be done in a plugin using ids

 

@Michiman when a player places a block, get the block placed, then set it to dirt.

 

I can try to make one, sorry if this is a stupid question but would i use an event to get the placed block? Or would i just check if the block is above the other block then turn it to dirt?

 

@Michiman well I don't know how the glitch occurs. Just check to see if the glitch would occur or not.

 

I am sorry, I do not think Bukkit can solve this as it is not a registered as a block unless we can add it to the Libary/Build path and create a bridge and use that.

 

@timtower might know if this is possible or not

 

Unless the item has a name that can be checked with bukkit there is no way to tell what block is being placed since it isn't in vanilla minecraft