After updating to Parallels 13 I found that my printer had ceased to display the "Converting to Post Script" dialog box that is the subject of this thread. Regardless of the software I was using, I could no longer get my printer (Epson XP-432) to print out more than one copy of any document, no matter how many copies I asked for. I went into VM Configuration>Hardware>Shared printer as described by EdgemontF and I could see that the "Show page set up options before printing" box was not checked.
I checked it, went into Word, and lo and behold, I found that I could once more print multiple copies of documents. Having the Post Script dialog box is a minor nuisance compared with not being able to print off multiple copies.
It is just sad that Parallels did not see this consequence when they issue version 13.