The affected packages cannot satisfy their cross Build-Depends, because
they happend to request libvpl2 for both the build architecture and the
host architecture at the same time and libvpl2 is not coinstallable. The
package uses a multiarch file layout and lacks maintainer scripts, so
marking it Multi-Arch: same is just fine. For more information, please
refer to https://bootstrap.debian.net/cross_all/libvpl.html. I'm
attaching a patch for your convenience.

Helmut