/usr/lib/x86_64-linux-gnu/libstarlink_ast_grf3d.so is in libstarlink-ast-dev 8.3.0+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libstarlink_ast_grf3d.so.0.0.0
/usr/lib/x86_64-linux-gnu/libstarlink_ast_grf3d.so.0.0.0