Hi, sorry it took some time to bring the package up to date regarding reproducible builds.
The patch has been introduced some while ago into libfizmo 0.7.12 / fizmo 0.8.2. Since the package is however currently in the process of being split up into separate libraries and frontends it took much longer than anticipated to bring these new versions into debian. Today, a patched version of libfizmo finally made it into the testing branch. As soon as all the other parts are completed and the old version has been completely replaced I'll mark this bug as closed. Best regards, Christoph.