/usr/lib/x86_64-linux-gnu/libbrasero-burn3.so is in libbrasero-media3-dev 3.12.1-4ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libbrasero-burn3.so.1.2.6
/usr/lib/x86_64-linux-gnu/libbrasero-burn3.so.1.2.6