Hi djaydino, and thanks for replying.
In this FSM I didn't enable the Inspector check in any variables, neither assigned categories to them.
This FSM is fixed and a template inside a prefab. The only FSMs where I tick the Inspector check and assign categories are SubFSM templates, which I run from fixed FSMs like this one.
So, I don't know why those variables got "orphaned" in the way you describe.
I tried your solution to clear up those lines, and it did work with some prior/additional renaming of the aformentioned template. Before trying to re-use the FSM name again, I mean.
Kind of tricky, but a nice workaround.
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EDIT: Just in case that's important, I'm using the custom 'Run FSM Func' action, instead of 'Run FSM'.