Every time I have Indigo turn the to "Fan On Always" setting it changes the set point to the highest setting in Ecobee temp range thresholds (on the latest build 2.4.2). I use the Fan ALWAYS and Fan AUTO to throw some fresh air in the Master Bedroom (every hour or so for about 10 minutes) but not have it run those dampers to long since we don't want the same temp as the living room. We have a separate split Mitsubishi split air unit set to mostly cool the bedroom except extreme cold months in the winter. I have reset everything (many times) and tried making sure the changes are set to hold type to "Indefinite HOLD". That doesn't make any difference. Every action performed (control pages, triggers or schedules ) used to set fan to "Always ON" changes the maximum set point to the Ecobee therm maximum threshold settings (regardless if the state is in HEAT or COOL.
I just downgraded to 2.3.3 and no longer have this problem (if that helps). Please let me know if you need a detailed bug log or any other information that would help in your search for the code fix.
Thanks,
Bill