All reports of debian-watch-file-should-uversionmangle-not-dversionmangle for the archive. The extended description of this tag is:
The version of this package contains alpha, beta, or rc, but a misleading Debian version mangling occurs in the debian/watch file. You should use the uversionmangle option instead of dversionmangle so that the prerelease is sorted by uscan before a possible future final release.
Refer to https://wiki.debian.org/DEHS for details.
This tag has not been emitted in any package tested by Lintian.