tags 923365 - moreinfo close 923365 thanks Big oops! Sorry, I have now double-checked and the report was based on a build log dated 2019-02-26, but apparently it took a while for me to actually submit the bug. The underlying bug in texlive was fixed in the meantime.
The package is sunny everywhere here: https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ftgl.html so I'm closing this. Thanks.