/usr/lib/x86_64-linux-gnu/libxmlsec1-openssl.so is in libxmlsec1-dev 1.2.25-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libxmlsec1-openssl.so.1.2.25
/usr/lib/x86_64-linux-gnu/libxmlsec1-openssl.so.1.2.25