/usr/share/pixmaps/maxima-icon.png is in xmaxima 5.37.2-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/pixmaps/../doc/xmaxima/maxima-icon.png
/usr/share/pixmaps/../doc/xmaxima/maxima-icon.png