[FORGE] autosaving keeps turning on even though I use save-off

Dear all

I use a scheduler with pterodactyl to use the save-all command every 30min.
The reason is because the default saving every 5min causes lagspike with the modpack Vault Hunters 3.

Even though I use save-off as a command, the autosaving keeps enabling by itself.

Is there a way to disable it permanently ?
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