Syllabification

[ReneZ]

The term adjad is a property of the written language, of course. If the Voynich MS is a rendition of a spoken text, then it plays no role whether that language was written as an adjad or not.

But to answer the question, in the one case I know, those vowels that are written are not always written after the consonant that they follow, but also above, below or in front of them.
And in the case of the many diphthongs, basically all around the consonant. This is not arbitrary, of course. 'e' is always written before, so my name is actually spelled  e-r-e-n

Thus, some symbols are always at the start of syllables, and since the language is mostly monosyllabic, at the start of words. There is also a symbol that can only appear at the end. (However, since this langauge - Thai - is written with all words strung together, this feature doesn't appear at all).

But yes, in principle this can happen.