#Tails was producing bit-for-bit reproducible live images, last I recall they had to massage somethings after processing it to make it work.
That said, not all the packages shipped in Tails are reproducible:
https://tests.reproducible-builds.org/debian/unstable/amd64/pkg_set_tails.html
You can make a #Reproducible iso out of not reproducible packages, as long as you use the same exact packages. :)