All reports of python3-depends-but-no-python3-helper for the archive. The extended description of this tag is:

The source package declares a dependency on ${python3:Depends} in the given binary package's debian/control entry. However, debian/rules doesn't call any helper that would generate this substitution variable.

Severity: serious, Certainty: possible

Check: debhelper, Type: source

This tag has not been emitted in any package tested by Lintian.