https://www.spigotmc.org/threads/bukkit-craftbukkit-spigot-bungeecord-1-13-pre7-development-builds.328883/

Hey there, we use this a lot on PirateCraft, we have over 100 custom brews. The new 1.13 Api removed material names, which would destroy this amazing plugin. can we get the necessary apis updates please now that the 1.13 spigot server is out and ready to help developers fix their plugins ready for 1.13.

Material names haven't been removed, numeric IDs have been removed. I've already prepared a good bit of the update, but it turned out that some more changes need to be done. See PR #156

Look at my username, I already replied to that merged PR :) This was an old ticket!