/usr/lib/paraview/libvtkPVVTKExtensionsRendering.so is in paraview 5.4.1+dfsg3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/paraview/libvtkPVVTKExtensionsRendering.so.1
/usr/lib/paraview/libvtkPVVTKExtensionsRendering.so.1