Spigot/Vanilla/BungeeCord 1.15 is out for general use and has been added to MCPanel but there seem to bee major Minecraft bugs
I probably wouldn't recommend this version for production use but use at your own risk, always make a full backup though and you'll be fine, take a backup of all worlds at least before updating.
Apart from the bugs people are also saying 1.15 has better performance compared to 1.14.4
md_5(Spigot creator) said:
released for general usage. This is a minor update with few server changes. Accordingly the API changes are minimal and full compatibility with 1.14.x API plugins is expected
me4502(WorldEdit developer) from this Spigot post said:
We haven't pushed an official build [for WorldEdit] as there are a few pretty major Minecraft bugs that larger block changes can trigger (think entirely corrupt worlds), so I strongly recommend keeping backups.
Some people are also reporting issues with ProtocolLib and players not being able to join
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