Which other manuscript contain the most Voynichese glyphs?

[Helmut Winkler]

How common would it have been in this type of script to mix abbreviations with Litterae Oblongatae? Doesn't it lead to confusion?

I think it is a mistake to compare Imperial charters with something like the Voynich- The peculiarities of the script of I. ch. are mostly Echtheitsmerkmale, signs of authenticityt, kept as a secret in the chancery and the originals were kept under lock and key for obvious reasons. It is not likely someone like the V. author had ever seen one-