Dictionaries built with dictfmt/dictzip (often called .dict.dz) contain timestamps: This file was converted from the original database on: $DATE dictzip gzip-compresses the dictionary and includes a timestamp in the header. . Call dictfmt with --without-time to prevent the timestamp in the dictionary.
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).