Describe the bug

This never happened, perhaps it started after the AAC (AdvancedAntiCheat) plugin was installed. A couple of people remained on the server, the rest were kicked and no longer allowed with the error "Exception Connecting:QuietException : Unexpected packet received during server login process (19ae037b227472616e736c617465223)" whose screenshot is below. Unfortunately, there are no logs in the console and there are no errors either. What could it be? (After the reboot, everything fell into place)

Version Info
ProtocolLib Dump: https://pastebin.com/BPBYt4gE

Spigot: 1.16.4
ViaVersion + ViaBackwards (4.0.1)
+BungeeCord