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Compatible with Via Version #1565
The output of command
That Spigot build looks a bit old (237 versions behind)! Might be relevant to update that: https://www.spigotmc.org/wiki/buildtools/
What client version are players attempting to connect from?
I'm not sure why you're running ViaVersion... you're running a 1.12.2 server, and ViaVersion doesn't yet support 1.13...
Are you perhaps also running ViaBackwards or ViaRewind, to allow in older clients?