Some packages have been blacklisted only on armhf in our test infrastructure because their builds take too long on the tiny armhf boards we're using. The mitigation against this is to add more architectures or to wait until we test against the debian archive, when it will become sensible to raise the 18h timeout for a single build. Until his happens, please rely on the amd64, i386 and arm64 tests.
Our notes about issues affecting packages are stored in notes.git and are targeted at packages in Debian in 'unstable/amd64' (unless they say otherwise).