invisibility, invulnerability bug

[HKS-HNS]

Bungeecord version

git:BungeeCord-Bootstrap:1.19-R0.1-SNAPSHOT:f9712cb:1680

Server version

git-Paper-448 (MC: 1.19.3) (Implementing API version 1.19.3-R0.1-SNAPSHOT) (Git: 155aa36)

Client version

1.19.3

Bungeecord plugins

0

The bug

There is a bug where players can make themselves invisible and invulnerable from other players and the tab menu. Here's how to reproduce the bug:

Watch the following video: https://youtu.be/mWxOejc5pXg

To trigger the bug, use a client that has a limited sending rate of 50 Kb/s. Then, join with a normal client and disable the limiter.
The bug works because the proxy kicks the player, but is still receiving packets, as seen in the following logs:

20:59:58 [INFO] [HNS_yt,/127.0.0.1:1257] <-> InitialHandler has connected
21:00:01 [INFO] [HNS_yt,/127.0.0.1:1271] <-> InitialHandler has connected
21:00:02 [INFO] [HNS_yt] disconnected with: You are already connected to this proxy!
21:00:02 [INFO] [HNS_yt] <-> DownstreamBridge <-> [lobby] has disconnected
21:00:02 [INFO] [HNS_yt] <-> ServerConnector [lobby] has connected
21:00:05 [INFO] [HNS_yt] -> UpstreamBridge has disconnected

Even though the player is online, the UpstreamBridge unregistered the player who joined because the old one was still sending packets.

Log output (links)

20:58:43 [INFO] Using standard Java JCE cipher.
20:58:43 [INFO] Using standard Java compressor.
20:58:43 [INFO] Enabled BungeeCord version git:BungeeCord-Bootstrap:1.19-R0.1-SNAPSHOT:f9712cb:1680
20:58:43 [INFO] Discovered module: ModuleSpec(name=cmd_alert, file=modules\cmd_alert.jar, provider=JenkinsModuleSource())

20:58:43 [INFO] Discovered module: ModuleSpec(name=cmd_find, file=modules\cmd_find.jar, provider=JenkinsModuleSource())

20:58:43 [INFO] Discovered module: ModuleSpec(name=cmd_list, file=modules\cmd_list.jar, provider=JenkinsModuleSource())

20:58:43 [INFO] Discovered module: ModuleSpec(name=cmd_send, file=modules\cmd_send.jar, provider=JenkinsModuleSource())

20:58:43 [INFO] Discovered module: ModuleSpec(name=cmd_server, file=modules\cmd_server.jar, provider=JenkinsModuleSource())

20:58:43 [INFO] Discovered module: ModuleSpec(name=reconnect_yaml, file=modules\reconnect_yaml.jar, provider=JenkinsModuleSource())

20:58:43 [INFO] Loaded plugin reconnect_yaml version git:reconnect_yaml:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Loaded plugin cmd_find version git:cmd_find:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Loaded plugin cmd_server version git:cmd_server:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Loaded plugin cmd_alert version git:cmd_alert:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Loaded plugin cmd_send version git:cmd_send:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Loaded plugin cmd_list version git:cmd_list:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [WARNING] Forced host server pvp is not defined
20:58:43 [INFO] Enabled plugin reconnect_yaml version git:reconnect_yaml:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Enabled plugin cmd_find version git:cmd_find:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Enabled plugin cmd_server version git:cmd_server:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Enabled plugin cmd_alert version git:cmd_alert:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Enabled plugin cmd_send version git:cmd_send:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Enabled plugin cmd_list version git:cmd_list:1.19-R0.1-SNAPSHOT:f9712cb:1680 by SpigotMC
20:58:43 [INFO] Listening on /0.0.0.0:25577
20:58:52 [INFO] [/127.0.0.1:1270] <-> InitialHandler has connected
20:58:53 [INFO] [HNS_yt] <-> ServerConnector [lobby] has connected
20:58:53 [INFO] Netty is not using direct IO buffers.

20:59:27 [INFO] [/127.0.0.1:1059] <-> InitialHandler has connected
20:59:28 [INFO] [HNS_yt] disconnected with: §cYou are already connected to this proxy!
20:59:28 [INFO] [HNS_yt] -> UpstreamBridge has disconnected
20:59:28 [INFO] [HNS_yt] <-> DownstreamBridge <-> [lobby] has disconnected
20:59:28 [INFO] [HNS_yt] <-> ServerConnector [lobby] has connected
20:59:34 [INFO] [/127.0.0.1:1089] <-> InitialHandler has pinged
20:59:34 [INFO] [HNS_yt,/127.0.0.1:1090] <-> InitialHandler has connected
20:59:35 [INFO] [HNS_yt] disconnected with: §cYou are already connected to this proxy!
20:59:35 [INFO] [HNS_yt] <-> DownstreamBridge <-> [lobby] has disconnected
20:59:35 [INFO] [HNS_yt] -> UpstreamBridge has disconnected
20:59:35 [INFO] [HNS_yt] <-> ServerConnector [lobby] has connected
20:59:43 [INFO] [HNS_yt,/127.0.0.1:1150] <-> InitialHandler has connected
20:59:43 [INFO] [HNS_yt] disconnected with: §cYou are already connected to this proxy!
20:59:43 [INFO] [HNS_yt] <-> DownstreamBridge <-> [lobby] has disconnected
20:59:43 [INFO] [HNS_yt] -> UpstreamBridge has disconnected
20:59:43 [INFO] [HNS_yt] <-> ServerConnector [lobby] has connected
20:59:46 [INFO] [HNS_yt,/127.0.0.1:1177] <-> InitialHandler has connected
20:59:47 [INFO] [HNS_yt] disconnected with: §cYou are already connected to this proxy!
20:59:47 [INFO] [HNS_yt] <-> DownstreamBridge <-> [lobby] has disconnected
20:59:47 [INFO] [HNS_yt] -> UpstreamBridge has disconnected
20:59:47 [INFO] [HNS_yt] <-> ServerConnector [lobby] has connected
20:59:52 [INFO] [HNS_yt,/127.0.0.1:1233] <-> InitialHandler has connected
20:59:52 [INFO] [HNS_yt] disconnected with: §cYou are already connected to this proxy!
20:59:52 [INFO] [HNS_yt] <-> DownstreamBridge <-> [lobby] has disconnected
20:59:52 [INFO] [HNS_yt] -> UpstreamBridge has disconnected
20:59:52 [INFO] [HNS_yt] <-> ServerConnector [lobby] has connected
20:59:55 [INFO] [HNS_yt,/127.0.0.1:1249] <-> InitialHandler has connected
20:59:58 [INFO] [HNS_yt,/127.0.0.1:1257] <-> InitialHandler has connected
21:00:00 [WARNING] [/127.0.0.1:1075] <-> InitialHandler - read timed out
21:00:01 [INFO] [HNS_yt,/127.0.0.1:1271] <-> InitialHandler has connected
21:00:02 [INFO] [HNS_yt] disconnected with: §cYou are already connected to this proxy!
21:00:02 [INFO] [HNS_yt] <-> DownstreamBridge <-> [lobby] has disconnected
21:00:02 [INFO] [HNS_yt] <-> ServerConnector [lobby] has connected
21:00:05 [INFO] [HNS_yt] -> UpstreamBridge has disconnected
21:03:35 [INFO] Closing listener [id: 0xc132b692, L:/[0:0:0:0:0:0:0:0]:25577]
21:03:35 [INFO] Closing pending connections
21:03:35 [INFO] Disconnecting 1 connections
21:03:35 [INFO] [HNS_yt] disconnected with: §cThe proxy server is restarting
21:03:35 [INFO] [HNS_yt] <-> DownstreamBridge <-> [lobby] has disconnected
21:03:35 [INFO] [HNS_yt] -> UpstreamBridge has disconnected
21:03:35 [INFO] Saving reconnect locations
21:03:35 [INFO] Disabling plugins
21:03:35 [INFO] Closing IO threads

Checking

• I am using BungeeCord and not a fork. Issues with forks should not be reported here.
• I think this is not an issue with a bungeecord plugin.
• I have not read these checkboxes and therefore I just ticked them all.
• This is not a question or plugin creation help request.