Command /plan and other don't work on backend servers

[MrShard]

Describe the issue

Commands /plan, /plan register, and other Plan commands don't work on backend Paper servers in proxy mode. When executing Plan commands on the backend server, there is no output at all - commands are completely ignored.

Commands work correctly on Velocity proxy console using /planproxy.

This prevents user registration, as /plan register needs to work on game servers.

Setup:

• Velocity 3.4.0 with Plan installed
• Paper 1.21.8 with Plan installed
• MySQL database shared between proxy and backends
• Webserver disabled on backends
• Allow_proxy_to_manage_settings: true enabled

Exceptions & Other Logs

No errors in logs on either proxy or backend servers

Plugin versions

• Plan version: 5.6 build 2965
• Velocity: 3.4.0
• Paper: 1.21.8

Additional information

Backend config excerpt:

Database:
    Type: MySQL
Webserver:
    Disable_Webserver: true
Plugin:
    Configuration:
        Allow_proxy_to_manage_settings: true
Plan.jar is installed on both proxy and all backend servers, all pointing to same MySQL database. Server shows up correctly in Plan web interface and player data is being collected.

[AuroraLS3]

When webserver runs on proxy the website will instruct to use /planproxy register

/plan command requires plan.command permission to use

[MrShard]

There is no output from this command, and permissions are not the issue here, since I'm an operator - or is that not enough?

https://github.com/user-attachments/assets/ef47fa53-84b0-436f-b336-07ece218c2fb

[AuroraLS3]

/planproxy register needs the permissions on the proxy server

[MrShard]

On Velocity, LuckPerms is installed, and I’ve been assigned a group with * (all permissions).