There's an uncoordinated transition for libvpx in unstable. I suppose you didn't
remember the soname had changed when re-uploading to unstable now that the
freeze is over. It affects a few of packages and I do wonder whether the rdeps
will build just fine or not. I saw this and shows that a few symbols were
removed, but I don't know if that affects our rdeps.
Can you check if the rdeps are fine, so we can schedule binNMUs if appropriate?