New Beginning has no known issues right now. I'm still missing some plugins and those will be added as soon as they are available: Admin Shops, Teleporters and Economy just to list most important ones.
Converting old worlds to 1.13.x is getting better but they still come out very laggy. I have not noticed any broken maps anymore but just walking thru short distance can be frustrating because map is rendering very slowly. More testing will be done before I start adding them to new setup.
HomeSpawnPlus is not going to be updated anymore, so I also need to find way to save your /home locations before I can move 907MC and Classic worlds to the new server.
SkyBlock will stay in old server longer than I though. The author of original plugin has dropped the support and he keeps telling that there is going to be new version available at the end of this year. I really hope that is true because right now, there is no alternative option to even start new SkyBlock with new plugin.