bronze sword production halted during upgrade from lvl 4 to 5
so I'm upgrading a bronze sword from 4 to 5 it takes 7 days, and lucky for me the production has stopped at 6 seconds so I guess I'm locked out of making any swords for 7 days. Why is production stopped? I haven't seen this happen on any of the other buildings. I'm guessing I've lost many thousands of swords at this point because both of the bronze swords that are upgrading are stuck at 6 seconds left on their production and my supply of bronze swords hasn't budged in the last several days during the upgrade.
Is this a known issue?