With the use of /mr, a player could reset the mineparty. Even if the /warp mp was inactive, you can reset it and the resources will also be reset.

There's player out there but im not sure who was it. But I did see kubazx656 mine without breaking the glass. He was able to mine through the glass. There was some people with me that time tho I can't remember the names.

Please do double the glass or encase the spawn of /warp mp to avoid this. Thanks