Hi there!
I believe besides the script call you can also use the default event command to Stop the timer. I'm not fully support my MV versions of the plugin anymore. So if the command is there and it does not work, it may be indeed a bug.
But! You can find all my MV plugins on this link https://hakuenstudio.itch.io/hakuen-studio-mv-museum and you can create a topic for support there for any of my MV plugins.