Hi,
i am in holidays, so i can not work on this thread like i would do for usual.
(Perhaps in some days or weeks)
Just some comments.
>>"I have the same issue"
If my explanation (above) doesn't fit to your problem, it looks like your issue is near to it, but not the same.
<Needs to much time now, to ask you the important questions>
>>"What I believe is that all those previews of blocks somehow generate a dwg instance when being displayed and when these instances are eliminated AutoCAD behaves as if it was closing a file and thus prompting the Auto Plot dialogue window."
No, previews are simple picture files you can find as waste in a subfolder of your block-dwg folder.
>>"I hope Autodesk developers are already aware of this bug and come with a solution soon, "
You have to start a bug report or support case (please use email support case).
Just writing in forums is useless in this point.
>>"I find interesting how it is very common that the first answers to threads are on the “it must be something you are doing” vibe."
Would it be not the case, it would be impossible to help (and solve) a big part of threads (or support cases).
Trust me, so many people thoughts it must be a software bug, that they are become unable to listen and test.
AND just in 0.01% (?) it is really a (new) bug!
So it isn't useful to start with "perhaps it is a bug, but it could be the usual behavior"
Because this would be fit to EVERY post (lol)
and 99,99% it is the wrong way, just for 0.01% it is the right one.
But you know it at the end, not at beginning of a thread.
>>" hope this throws some more light on the issue."
Please read the post again, i can not see any word about the block palette,
so it looks like you are talking about another situation.
(with the same symptom)
Q1: You missed to tell us your product version(or? sorry, i am working on a small mobile).
Please share a screenshot of your ABOUT dialog, thx)
Without testing, i guess you found a bug, but i am sure you didn't found all pieces of the problem.
<find the simplest situation from scratch to replicate the problem and let me know>
*PM for you