This is related to Epic 4.2.1 which I know is no longer supported but here
Equations tags defined as EMPTY (i.e. <cp>, <rp>) are being saved in XML
files without the trailing slash like this, <rp>, instead of with the
slash like this <rp/>.
I tried making sure the atimath entity file was in XML format (no tag
minimization chars) and recompiling but nothing worked. It looks like
this is a bug at least in this version. Other EMPTY tags in the same file
are being saved to disk correctly - just the equation tags are incorrect.
Has anyone else come across this before?