Time string is coming from system. I am just using system variables sunset and sunrise to set values for variables, like:
This one have now fixed time set as if I am using system sunset/sunrise then I am getting this error:
Error: Unparseable date: "2021-11-26T13:30:00+0000"
This issue came after recent Hubitat updates as I have not touched rule for ages.
I took export of rule and manually changed values to correct ones to .json and imported (and renamed) it back and changed sunset/sunriset to be fixed times, thats how I managed even open the rule. Original rule gives still the error.
And what it comes to release note about rule machine, I did not noticed that one before. But I am not using variables as triggers.