WORLDGUARD-3393 - Reported by Theepwner

Setting on-use to deny for a spawnegg will not let you break blocks while holding it. I believe this will be the same for any block/item you set. Shouldn't on-use just watch for right-clicks? Additionally, using the on-destroy-with to try bypass this won't work. Here's an example:

[383:56]
on-use=deny
on-destroy-with=allow