The ticket you mentioned was marked as fixed for 1.3.6 so - unless it's been "unfixed" since then - I'd say that the problem you're having is something different.
I've just done a quick test creating some text with some tabs in, creating a style with a tab stop as dotted, applying the style, then editing the style - moving the stop, changing the filler, etc. - and it worked as I'd expect. I tried a few ways to "break" it but it seems to work for me.
Can you give a specific workflow that can be precisely followed to replicate the problem?