Сan't help me?

Please use the provide commands f rom Oxide; not manually viewing the data file. All players are added to the 'default' group on connection. You can use the 'oxide.show user USERNAMEORID' command to see which groups they are in.

hi, I manually transfer people to default group. (Use plugin: PermissionsManager)

They are automatically added each time they connect with Oxide, so that would not be necessary.

New user log: does not seem to be in any BetterChat group - falling back to plugin's default group! This should never happen! Please make sure you have a group called 'default'
And users cannot use plugins until I manually add them to the group default

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If I had no problem with this I would not create a theme :)

Did you manually modify any of the .data files, copy them from somewhere while the server was running, or anything else?

I can show my oxide.users.data there it will be seen that some users without a group.

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1. I shut down the server
2.Cleared the folder "server/my_server" this files: companion.id, Log.EAC.txt, player.blueprints.3.db, player.deaths.3.db, player.identities.3.db, player.states.191.db, player.tokens.db, *.map, *.sav, sv.files.0.db (folder cfg, not delete)

I don't need to see it, I would need to see the results of the command usage mentioned previously on users that are currently conencted.

no manually I did not modify the file

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can you connect to my server? (grant necessary rights)

Player 'wotto****otoo (7656****880951)' permissions:
No permissions currently granted

Player 'wotto****otoo (7656****880951)' groups:
Player is not assigned to any groups
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
System.Action`1:Invoke(T)
ConsoleSystem:Internal(Arg)
ConsoleSystem:Run(Option, String, Object[])
ConsoleNetwork:OnConsoleCommandfromServer(Message)
Client:OnNetworkMessage(Message)
Facepunch.Network.Raknet.Client:HandleMessage()
Facepunch.Network.Raknet.Client:Cycle()
Client:Update()

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This is a new user

What do you see in your console/logs when players (such as that player) connect to the server?

wotto***otoo with steamid 7656******0951 joined from ip **.1**.**.1*4:65304
NetworkId 7656******0951 is 2259856 (wotto***otoo)
wotto***otoo [77656******0951] has spawned
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)
Console log

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interesting is that users who were before the wipe did not find such problems

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I have one third-party library Oxide.Ext.NoKickBloody.dll
Could there be a problem because of this?

I'm not familiar with that extension, so I can't really say. Oxide is what handles the default group assignments, so if something is modifying the Oxide.Core, it's very well possible it is breaking it.