Duplicate UUID on frontend connection!

[Stixil]

Describe the bug, provide any errors
Server hangs and does not allow players to join: https://mcpaste.io/c66f5f5d1d0c9fd2

How can we reproduce it?
Unsure how to reproduce, it just happens every few hours or so.

ViaVersion Dump
https://dump.viaversion.com/542d5ff485a5270952b67d1dd70a16be3e4131157fb114a291a3d76939cf0f02

Additional server info
Waterfall-370
Paper-133 1.16.1
[11:48:02 INFO]: Plugins (38): AcoWorth, BKCommonLib, BlockLocker, BossShopPro, BungeeTabListPlus, CoreProtect, DeathChestPro, Harbor, IllegalStack, InventoryRollback, JukeBox, LaggRemover, LightCleaner, LolBans, LuckPerms, MineSecure*, Multiverse-Core, NoMobGriefing, NoteBlockAPI, PetTheDog, PlaceholderAPI, ProtocolLib, ProtocolSupport, QuickShop, Spartan, StaffFacilities, StayPut, StickyChat, StickyCommands, StickyTamer, StickyWallet, Vault, ViaVersion, VillagerOptimiser, WarpSystem, WorldEdit, WorldGuard, WorldGuardExtraFlags

Checklist

• I have included a Viaversion dump
• If applicable, I have included a paste (not a screenshot) of the error
• [] I have tried a build from https://ci.viaversion.com/ and the issue still persists

[SpEeD11]

getting the same issue after updating to 3.1.0

[botinok224]

up

[dmitriJ2101]

up

[ghost]

up

[AshAritra]

me too

[skyeredwood]

Bump - still an issue.

[Kichura]

Does this issue still cause problems on 4.6.2-snapshot with paper 1.16.5? (+ if you have a proxy with waterfall/velocity then use latest)

[Kesuaheli]

Just got it with paper-1.19.2 and ViaVersion-4.6.1
Log is like:

UUID of player <USERNAME> is <UUID>
<USERNAME> lost connection: You logged in from another location
<USERNAME> left the game
[ViaVersion] Duplicate UUID on frontend connection! (<UUID>)
<USERNAME> joined the game
<USERNAME>[/<IP:PORT>] logged in with entity id <...>

*Note: <USERNAME>, <UUID> and <IP:PORT> are placeholders and were replaced accordingly

Maybe the ViaVersion warning comes because of the login from another location?