Just remove the pdf reader for now. There is no rush to find a replacement for installation by default. Giving this time to look at various alternatives and entertain suggestion/discussion.
The other alternative is something that uses poppler as backend. qpdfview is the best UI and feature choice also opens DjVu and postscript formats. Doesn’t pull in a bunch DE specific deps.
Which then stalled. qpdfview package is currently orphaned, not maintained by any Debian maintainer.
Not sure we should make this a factor or keep ignoring https://tracker.debian.org/pkg/`package-name` as we do for most packages. If that was to be applied consistently it might reveal a huge mess of actually non-maintained or less than ideally-maintained packages. Might not be manageable to follow these. An option would be to ignore this, hope, and wait for Debian to take action. Or we could apply looking at tracker.debian.org when considering new packages for installation by default only.