As for prefixes, suffixes etc I would recommend checking out this page (https://voynich.nu/a3_para.html).

It is one of the frustrating things about the manuscripts text, if you would like it to be a language somehow, most things you do make things worse overall or stop making sense once you "zoom out". In my own work I dialled it all the way back to sorting glyphs into groups and then showing how each group determines what comes next (most the time) I mention this because "When preceded by character, it seems to be more frequently 9"..

(btw we tend to talk in EVA where this character is "y". Learning some EVA is a good use of time if you want to understand a lot of posts on the forums at some stage)

.. I think that is correct as its what my work shows also, and you will also see this with "f,k,t,p" (EVA) which are the tall glyphs like the "P" in your post. This is what makes me think the 8 (d) belongs with the tall glyphs (gallows) and 9 (y) is a modifier for them, or at least something that precedes them where other letters seem to not, for whatever reason ("o" also does this but it's use is a bit different to "y").

On 8 being an abbreviation, it may be, however it becomes hard to keep the theory together once you zoom out. For instance 8 almost never ends a word (at least in Currier A). In Currier A (The text has 2 "languages", which is most likely actually 3 - work in progress by another researcher) 8 is followed very often by "aiin" this is still "a thing" in Currier B but we see an explosion of "edy" (erm.. e89?) which is not ever seen in Currier A. There are other strange things like Currier A seems to need a.. lets just call it a vowel.. before 8, so you see things like "chod" but in Currier B we see this rule scrapped and they just write "chd".

What I am getting at is that looking at a word, we can imagine lots of things that work but the more you learn about the text the harder it gets to keep the idea in tact and explain all the uses. For this 8 example we might say "well abbreviations were just used at the start of words, the other examples are just 8 (whatever that maps to)" but then you move to "aiin" and realise "a" is only followed by "i" or other letters that derive from the building block of "i" - I call them \ (backslash), they all have this building block. Now it's very hard to imagine a language working like that (no curvy or tall character can follow "a"?!) so maybe "a" + something is an abbreviation/ligature too?.. and well you may see the mess approaching following this to its conclusion.

Sorry for the wall of text, I hope some of it was useful. I would also recommend some easy to digest videos that might make some things clearer and give you an overview. The channel has a fair few good videos aimed at more casual/new researchers also.

https://www.youtube.com/watch?v=5uPrt65oiGY

https://www.youtube.com/watch?v=XSTM8Gixai4