Chord symbols: in some cases, 0 (zero) does not turn into ø

The "m" is not supposed to be used in a half-diminished chord, it's just plain "f0". If "fm0" was displaying a half-diminished symbol before, that could be considered a bug - it's supposed to be context-dependent, so you can still use "0" in other contexts, and it only changes to half-diminished in the proper context (immediately after the root). But I can verify that apparently, this "worked" in 3.2.3. I didn't deliberately change anything about this, though, so I'm still investigating to understand what happened and make sure something else didn't change for the worse.

With expanded chords like these, I always push my limits ;-). In the German Wikipedia entry (in difference to the English) it should be correct to notate is as "mØ", see the table there: https://de.wikipedia.org/wiki/Septakkord. Not sure and without being a professional, but it seems to be a difference between German and international spelling (see the difference between half-diminished and diminished chord).

This ends up being a side effect of the change to allow you to specify superscripting for extensions and modifiers, which requires being consistent about how we classify symbols. "0" right now is a gray area. Since 0 doesn't really make sense as an extension, I can probably special case this and treat it as the half-diminished symbol even in this case without breaking anything else, as I doubt anyone is really trying to create a minor-zeroth chord. But still, do keep in mind this is not correct notation.

EDIT: posts crossed, but I would still suggest that Wikipedia has been known to be in error...

"...but I would still suggest that Wikipedia has been known to be in error..." - agree ;-).

I don't know half-diminished and Minor Chords, for example Cdim, had the Eb in the chord, what do you add to make the Minor ?

Via German Wikipedia entry (aware it isn't a professional resource) for example a C diminished chord ( written as C°, C07, Cv7 ) means "C", "Eb", "Gb" and "𝄫b" (resp. "heses" in German spelling), a C half-diminished chord (written as CmØ, Cm5-/7) means "C", "Eb", "Gb" and "Bb" (resp. "B" in German spelling). Don't have other resources at time - but it's correct, both chords include the minor third by default.

My own take on this is that "the simpler, the better". With the music I write I am not really concerned with how it was done in the past, I want the info to be direct.

Personally, I would not add the minor.

If I need just a half diminished chord, typing a 0 (zero) works, but if I have to had a complex extension e.g. b9 then it reverts by to a diminished chord with a b9.. any ideas?

Good practice to always include the 7. So, C07b9.

(See Marc's first post above).