/usr/lib/x86_64-linux-gnu/libbmsh3d.so is in libvxl1-dev 1.17.0-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libbmsh3d.so.1.17
/usr/lib/x86_64-linux-gnu/libbmsh3d.so.1.17