Package: openscad Version: 2021.01-7 Severity: seriousJustification: rc-policy - packages must be buildable within the same release.
User: debian...@lists.debian.org Usertags: edos-uninstallable
openscad build-depends on libcgal-qt5-dev which is no longer built by the cgal source package. It is still present in unstable as a cruft package but is completely gone from testing. libcgal-qt6-dev seems to be the replacement, but would presumablly mean migrating your package to qt6.
