Bug#912993: It's a configuration issue, in fact an old bug has been fixed

[Alf <alf.debianfan@gmx.de>]

I was hit by the same issue as well, getting cryptic suffixes appended
the the filename.

I carefully went through the configuration file and found:

> ###########################################################################
> #									  #
> # Filename Settings							  #
> #									  #
> ###########################################################################

...
> ### Key: TitlePref (config, ppd, lpoptions) ##  where to look first
> for a title when creating the output filename ##  (title in PS file
> or title on commandline): ##  0: prefer title from %Title statement
> in the PS file ##  1: prefer title passed via commandline ###
> Default: 0
>
> TitlePref 0


which means that the filename is derived preferable from the title
statement in the PS file. However the old beheaviour was to derive the
output filename from commandline = input filename, strip the suffix and
append "pdf" instead.

So, I set that Option to "1"
> TitlePref 1

And now my PDF-printer works as it used to since years.

I double checked with the configuration file in Stretch, ist is
precisely the same as it shipped with Buster with regard to this option
(default = 0), so actually in Stretch it was not performinmg as
documentatoin says - thus buggy.