Monitors don't register changes to a custom variable.

[Steve0Greatness]

Renaming a custom variable and deleting a custom variable do not get registered by monitors.

[DELOLCAT]

Sorry, but what do you mean when you say "custom variable"?

[jwklong]

custom variables

[Steve0Greatness]

Sorry, but what do you mean when you say "custom variable"?

https://docs.penguinmod.com/development/extensions/api/custom-variables/

It's an API