1.2.1b - Datapack 1.21 & Fixed Memory Leaks
datapack 1.21
- added a switcher so that when you generate a datapack you can select between old (1.20 and lower) or new (1.21 and higher) datapack version. #16

Memory leaks
It has been a long time there is a memory leaks while clicking reload world list or drag'n'drop a new world in the list. Now it's fixed