We're continuing to fix issues and reduce the bugs in 1.13, consider supporting the project and helping us continue. Also report bugs here.
Known bugs 1.13 client:
Blocks which connect do not connect properly (fences, doors, stairs etc) - Click here to follow progress on GitHub. Due to connections now being serverside we're looking for help in developing an optimal solution.
Changelog (All fixes are for 1.13):
1.13.1 support (by ForceUpdate1, Gerrygames, Pokechu22, Myles)
Fix Bungee duplicate login bug
Fix 1.13 metadata rewriting (by creeper123123321)
Fix invalid biomes (by creeper123123321)
Fix Bungee relay messages (by creeper123123321)
Fix various memory leaks (by creeper123123321)
Fix team suffix not having prefix colour (by creeper123123321)
Remap negative block ids to air
Remove various debug code
Fix noteblocks (by creeper123123321)
Fix sound effect writing, advancements, block data (by creeper123123321)
Fix advancements (by Matsv)
Fix WorldDownloader (by Pokechu22)
Fix StopSound plugin channel (by NorthPL)
Fix dust particles (by Gerrygames)
Fix server icon bugs (by Dinnerwolph)
Fix various italic issues in renaming items (by creeper123123321)
As a side note, huge thanks to Hive for giving us a brand new server for hosting our software, it allows us to continue pushing updates and handle the number of people downloading/using our maven.