I tried several times but I couldn't recreate it with an unmodified Team Deathmatch add-on that previously caused (?) the error. My add-ons have not changed since the error. I did visit a few servers so my cached add-ons have changed but I don't think that affects server creation. But I did discover by comparing the old log and a new log (where I managed to start a server with exactly the same add-ons) that next on the loading list would have been GameMode_ZAPT. In both logs TDM is loaded correctly. In the error log ZAPT is not loaded but instead the load starts over.