I think there's a misunderstanding here. What I meant to say is that "cz" in German manuscripts always (as far as I'm aware) stands for the sound "tz". Sometimes scribes write only "z", but the sound is the same. For example, in medieval documents you can find both czehn and zehn.
I still transcribe it as "cz", because this appears to be the custom: in professional transcriptions, they write "cz" for the ligature, in the understanding that the sound is actually "tz". As an example, here are all the spelling variations of (moder German) Gewürz, as transcribed in CoReMa, a collection of cooking manuscripts I use a lot because of the excellent transcriptions:
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In summary: when the cz ligature is used in Medieval German texts, it stands for the sound "tz". But it is not the exclusive way to represent this sound.
In Latin, the ligature has a different function alltogether.
What I asked you is the following: since you think we should look at other languages, do you know how the ligature functioned in medieval texts in those languages?
I still transcribe it as "cz", because this appears to be the custom: in professional transcriptions, they write "cz" for the ligature, in the understanding that the sound is actually "tz". As an example, here are all the spelling variations of (moder German) Gewürz, as transcribed in CoReMa, a collection of cooking manuscripts I use a lot because of the excellent transcriptions:
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In summary: when the cz ligature is used in Medieval German texts, it stands for the sound "tz". But it is not the exclusive way to represent this sound.
In Latin, the ligature has a different function alltogether.
What I asked you is the following: since you think we should look at other languages, do you know how the ligature functioned in medieval texts in those languages?