Currently on Spring/Summer/Autumn Turn 3. Playing new campaign as Seleucids fresh for 0.6.1, no other mods installed. Twice now have had half a dozen settlements revolt at turn end without warning or red public order/flagged that turn or the one previous. All had garrisons of some sort. They were spread all over the map. No other event notice at next turn to indicate this is scripted or intentional, other than the individual revolt notices. Reloading the previous end turn autosave seems to resolve the revolts, so it seems a bug rather than a feature?

On a side note, reloading the previous end turn autosave seems to reset agent movement as well. They'll show a red arrow if they had orders on the map already, but will have all their actual movement if you order them again. Haven't tested to see if this happens every time or just when the revolt thing happens, but might be worth looking into so it isn't exploited.