You also restarted Home Assistant in order to have it accept the changes. Restarting can sometimes have a curative effect for other problems. I can’t say for sure it was the cure in this case but it’s more plausible than introducing attributes and timestamps that aren’t used by any of the automations.
You could be right. I also rebooted devices instead of restarting HA from Configuration page.
reading is gives me the impression that you store account information of the instances in plain text, is that correct?