I think the glass shards from t1 should come back to t2, it takes forever to mine glass just for nothing, so glass shards could fill that empty void with atleast giving the player a little reward back.
Maybe it could be random, but if it has fortune then that could be enough, the crafting recipe (in my opinion) could be either four glass shards at any corner like a square or 9 shards filling he entire table?
SMPEarth was originally a private, whitelisted Minecraft server, featuring a custom-generated 1:3000 scale map of the Earth, exclusive to a group of selected popular Minecraft creators and streamers. Now, SMPEarth is publicly accessible on Java Edition where anyone can join. Boasting a community of 7000+ members and 2 main servers to choose from and experience (Casual Towny and Siege Towny), SMPEarth's primary goal is to become the most advanced Earth server in Minecraft.