The loss of 4,495 issues where lost in a past MantisBT upgrade; many years before I became webmaster, the loss is noted on the triage page of the Gramps wiki!
The next issue 2621 still exist in the bugtracker and that was created in 2009!
Ouch. Well, I guess I’ll annotate the 2 GEPS references to 2620 with the information that it was for Gramps 3.2 in 2009 for compatibility to Python 3.0, the report was lost & point at a representative message on the Maillist archive.