The error occured when trying to install 'markupsafe' v3.0.3 python package (dependency of 'apkg') on debian-11-i386 arch.
Fixed by preinstalling older version of 'markupsafe' package before the installation of 'apkg'.

Since the behavior is added to 'pkg-deb-legacy' it also effects packaging of ubuntu-18.04-amd64.
Also debian-11-amd64 is moved to 'pkg-deb-legacy' together with effected debian-11-i386 just for code clarity.