I think the original is the one distributed as an XEmacs package.  Recompiling 
with my current XEmacs doesn't have the problem.

xemacs-base          2.45
XEmacs 21.5  (beta34) "kale" 698a9aa86de4 [Lucid] (x86_64-apple-darwin14.5.0, 
Mule) of Tue Sep 29 2015 on Stephens-MacBook-Pro.local