116v

[JoJo_Jost]

I don't understand why you read this 8-shape like a ts-ligature). 

It's so annoying, I read it once and can't find the source anymore. It had something to do with the Bavarian dialect, where "tz" (not ts) was sometimes written as a 8 Ligatur.

In Lexicon abbreviaturarum, on page 330, there is only one symbol for "ts", which looks like an 8:

   

However, most of the ligatures in the Lexicon abbreviaturarum are Latin, and ts is rather modern, while tz does not occur in Latin at all.  That is why you will not find it there. Tz is pure german.

But you can also deduce it this way:

From the symbols on page 359 of Lexicon abbreviaturarum, it appears that z was written more or less like a 3, among other things. And on page 330, there are spellings in which the t alone was written more or less like an 8. 

   

If you want to write the 8 of the t and the 3 of the z together as one ligature, it makes sense to combine them directly as a single 8. Especially since tz is not actually two letters, but a hard z.