You able to provide the full server logs? also what is the forwarding server running on?
here:
container@pterodactyl~ java -version
openjdk version "18.0.2.1" 2022-08-18
OpenJDK Runtime Environment Temurin-18.0.2.1+1 (build 18.0.2.1+1)
OpenJDK 64-Bit Server VM Temurin-18.0.2.1+1 (build 18.0.2.1+1, mixed mode, sharing)
container@pterodactyl~ java -Xms128M -Xmx2048M -jar server.jar
[22:23:41 INFO]: Using mbed TLS based native cipher.
[22:23:41 INFO]: Using zlib based native compressor.
[22:23:41 INFO]: Enabled Waterfall version git:Waterfall-Bootstrap:1.20-R0.2-SNAPSHOT:0e657ed:545
[22:23:41 INFO]: Not on Windows, attempting to use enhanced EpollEventLoop
[22:23:41 INFO]: Epoll is working, utilising it!
[22:23:41 INFO]: Discovered module: ModuleSpec(name=cmd_alert, file=modules/cmd_alert.jar, provider=JenkinsModuleSource())
[22:23:41 INFO]: Discovered module: ModuleSpec(name=cmd_find, file=modules/cmd_find.jar, provider=JenkinsModuleSource())
[22:23:41 INFO]: Discovered module: ModuleSpec(name=cmd_list, file=modules/cmd_list.jar, provider=JenkinsModuleSource())
[22:23:41 INFO]: Discovered module: ModuleSpec(name=cmd_send, file=modules/cmd_send.jar, provider=JenkinsModuleSource())
[22:23:41 INFO]: Discovered module: ModuleSpec(name=cmd_server, file=modules/cmd_server.jar, provider=JenkinsModuleSource())
[22:23:41 INFO]: Discovered module: ModuleSpec(name=reconnect_yaml, file=modules/reconnect_yaml.jar, provider=JenkinsModuleSource())
[22:23:41 INFO]: Loaded plugin reconnect_yaml version git:reconnect_yaml:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Loaded plugin cmd_find version git:cmd_find:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Loaded plugin cmd_server version git:cmd_server:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Loaded plugin cmd_alert version git:cmd_alert:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Loaded plugin cmd_send version git:cmd_send:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Loaded plugin cmd_list version git:cmd_list:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Loaded plugin EaglercraftXBungee version 1.0.8 by lax1dude
[22:23:41 WARN]: Forced host server pvp is not defined
[22:23:41 INFO]: Enabled plugin reconnect_yaml version git:reconnect_yaml:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Enabled plugin cmd_find version git:cmd_find:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Enabled plugin cmd_server version git:cmd_server:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Enabled plugin cmd_alert version git:cmd_alert:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Enabled plugin cmd_send version git:cmd_send:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO]: Enabled plugin cmd_list version git:cmd_list:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:23:41 INFO] [EaglercraftXBungee]: Eaglercraft is listening on: /0.0.0.0:8081
[22:23:41 INFO] [EaglercraftXBungee]: Connected to database: jdbc:sqlite:eaglercraft_skins_cache.db
[22:23:41 INFO] [EaglercraftXBungee]: Connected to database: jdbc:sqlite:eaglercraft_auths.db
[22:23:41 INFO]: Enabled plugin EaglercraftXBungee version 1.0.8 by lax1dude
[22:23:41 INFO]: Listening on /0.0.0.0:30020
container@pterodactyl~ Server marked as stopping...
[22:24:23 INFO]: Closing listener [id: 0x688001e9, L:/[0:0:0:0:0:0:0:0%0]:30020]
[22:24:23 INFO]: Closing pending connections
[22:24:23 INFO]: Disconnecting 0 connections
[22:24:24 INFO]: Saving reconnect locations
[22:24:24 INFO]: Disabling plugins
[22:24:24 INFO] [EaglercraftXBungee]: Eaglercraft listener closed: /0.0.0.0:8081
[22:24:24 INFO] [EaglercraftXBungee]: Successfully disconnected from database 'jdbc:sqlite:eaglercraft_skins_cache.db'
[22:24:24 INFO] [EaglercraftXBungee]: Successfully disconnected from database 'jdbc:sqlite:eaglercraft_auths.db'
[22:24:24 INFO]: Closing IO threads
[22:24:26 INFO]: Thank you and goodbye
>....
container@pterodactyl~ Server marked as offline...
[Pterodactyl Daemon]: Checking server disk space usage, this could take a few seconds...
[Pterodactyl Daemon]: Updating process configuration files...
[Pterodactyl Daemon]: Ensuring file permissions are set correctly, this could take a few seconds...
container@pterodactyl~ Server marked as starting...
[Pterodactyl Daemon]: Pulling Docker container image, this could take a few minutes to complete...
[Pterodactyl Daemon]: Finished pulling Docker container image
container@pterodactyl~ java -version
openjdk version "18.0.2.1" 2022-08-18
OpenJDK Runtime Environment Temurin-18.0.2.1+1 (build 18.0.2.1+1)
OpenJDK 64-Bit Server VM Temurin-18.0.2.1+1 (build 18.0.2.1+1, mixed mode, sharing)
container@pterodactyl~ java -Xms128M -Xmx2048M -jar server.jar
[22:24:28 INFO]: Using mbed TLS based native cipher.
[22:24:28 INFO]: Using zlib based native compressor.
[22:24:28 INFO]: Enabled Waterfall version git:Waterfall-Bootstrap:1.20-R0.2-SNAPSHOT:0e657ed:545
[22:24:28 INFO]: Not on Windows, attempting to use enhanced EpollEventLoop
[22:24:28 INFO]: Epoll is working, utilising it!
[22:24:28 INFO]: Discovered module: ModuleSpec(name=cmd_alert, file=modules/cmd_alert.jar, provider=JenkinsModuleSource())
[22:24:28 INFO]: Discovered module: ModuleSpec(name=cmd_find, file=modules/cmd_find.jar, provider=JenkinsModuleSource())
[22:24:28 INFO]: Discovered module: ModuleSpec(name=cmd_list, file=modules/cmd_list.jar, provider=JenkinsModuleSource())
[22:24:28 INFO]: Discovered module: ModuleSpec(name=cmd_send, file=modules/cmd_send.jar, provider=JenkinsModuleSource())
[22:24:28 INFO]: Discovered module: ModuleSpec(name=cmd_server, file=modules/cmd_server.jar, provider=JenkinsModuleSource())
[22:24:28 INFO]: Discovered module: ModuleSpec(name=reconnect_yaml, file=modules/reconnect_yaml.jar, provider=JenkinsModuleSource())
[22:24:28 INFO]: Loaded plugin reconnect_yaml version git:reconnect_yaml:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Loaded plugin cmd_find version git:cmd_find:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Loaded plugin cmd_server version git:cmd_server:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Loaded plugin cmd_alert version git:cmd_alert:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Loaded plugin cmd_send version git:cmd_send:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Loaded plugin cmd_list version git:cmd_list:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Loaded plugin EaglercraftXBungee version 1.0.8 by lax1dude
[22:24:28 WARN]: Forced host server pvp is not defined
[22:24:28 INFO]: Enabled plugin reconnect_yaml version git:reconnect_yaml:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Enabled plugin cmd_find version git:cmd_find:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Enabled plugin cmd_server version git:cmd_server:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Enabled plugin cmd_alert version git:cmd_alert:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Enabled plugin cmd_send version git:cmd_send:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO]: Enabled plugin cmd_list version git:cmd_list:1.20-R0.2-SNAPSHOT:0e657ed:545 by WaterfallMC
[22:24:28 INFO] [EaglercraftXBungee]: Eaglercraft is listening on: /0.0.0.0:8081
[22:24:28 INFO] [EaglercraftXBungee]: Connected to database: jdbc:sqlite:eaglercraft_skins_cache.db
[22:24:28 INFO] [EaglercraftXBungee]: Connected to database: jdbc:sqlite:eaglercraft_auths.db
[22:24:28 INFO]: Enabled plugin EaglercraftXBungee version 1.0.8 by lax1dude
[22:24:28 INFO]: Listening on /0.0.0.0:30020
container@pterodactyl~ Server marked as running...
[22:24:44 ERROR]: [/68.251.48.233:60154] <-> InitialHandler - encountered exception: net.md_5.bungee.util.QuietException: Unexpected packet received during login process! 03010238010002340303f43c80480c50
[22:24:44 ERROR]: [/68.251.48.233:60155] <-> InitialHandler - encountered exception: net.md_5.bungee.util.QuietException: Unexpected packet received during login process! 0301025801000254030355fb77421292
[22:24:44 ERROR]: [/68.251.48.233:60157] <-> InitialHandler - encountered exception: net.md_5.bungee.util.QuietException: Unexpected packet received during login process! 030102580100025403034823ee0e9461
[22:37:37 ERROR]: [/90.219.52.121:50285] <-> InitialHandler - encountered exception: net.md_5.bungee.util.QuietException: Unexpected packet received during login process! 03010200010001fc0303f696445af872
[22:37:45 ERROR]: [/90.219.52.121:50403] <-> InitialHandler - encountered exception: net.md_5.bungee.util.QuietException: Unexpected packet received during login process! 03010200010001fc03032ce6faa41cfd
full logs.
The forwarding server is a normal paper java 1.8.8 server