The following is a transcript of the error:
-----------------------8<-------------------------

# sudo apt -o=Debug::pkgProblemResolver=1 install vtk-dicom-tools
Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) libvtk9.3:amd64 < 9.3.0+dfsg1-1 @ii mK Ib >
Broken libvtk9.3:amd64 Breaks on libvtk9.1:amd64 < none @un H > (<
9.3.0+dfsg1-1)
  Considering libvtk9.1t64:amd64 1 as a solution to libvtk9.3:amd64 19
Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

Unsatisfied dependencies:
 libvtk9.3 : Breaks: libvtk9.1 (< 9.3.0+dfsg1-1)
Error: Error, pkgProblemResolver::Resolve generated breaks, this may be caused
by held packages.

-----------------------8<-------------------------

It appears that

* libvtk9.3 is installed (9.3.0+dfsg1-19.3.0+dfsg1-1)
* libvtk9.3 breaks libvtk9.1 < 9.3.0+dfsg1-1
* libvtk9.1t64 provides libvtk9.1 = 9.1.0+really9.1.0+dfsg2-8
* vtk-dicom-tools depends on libvtk9.1t64 >= 9.1.0+really9.1.0+dfsg2

Except for the breaks/provides having different names, this appears to be a
fairly straightforward conflict, and shouldn't error out.

- Hari

Dear Maintainers,

This is a friendly ping about a usrmerge bug in one your packages.

Please consider fixing it soon.

Thanks,
Chris

Hi Chris,

Apologies for the hold-up. Over the last several weeks, I have worked on a release in Salsa that addresses this bug, and others.
Currently putting the final touches, after which I expect my co-maintainer to sign off on and upload the new source release in the coming days.

Best regards,
Daniel