Fix corrupted font in multi level list

I've a multi level list defined in Word 2013.

It's level 4 is corrupted and looks strange (all other levels are fine):

Opening "font" properties from "define new multilevel list" window I can see that it has font size 0.

However, even after fixing font size (and also re-selecting all values just to be sure), I can't approve changes by pressing OK, neither go to advanced tab as I'm getting this error message:

I can close the window only by pressing Cancel. As it's a multilevel list, I can't easily select part of it, format as needed, then change the style to match formatting.

I've also tried with a macro:

• Font.reset didn't help
• Font.Size is 0; .Position, .Scaling & .Spacing are all 9999999, but setting them to a valid value (12, 0, 100, 1 respectively) doesn't do anything at all (no error message, but also no improvement).

How can I fix this font without recreating the whole list style?

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