Battery issue, known bug

Hi!
Since i bought my Fenix 5, one month ago, updated to v 12 on the first day of use, battery life has been awful.
Without recording any activity, the watch battery drains 25-30% every day.
I always kept 20% display light for 4 secs and only after dark on wrist move.
In the last weeks i tried disabling activity tracking as well as Move IQ and stopped wearing it while sleeping. I just left on phone notifications and HR, but that didn’t make much difference, just a few percentage points per day.

So I called the italian support center, where a not very polite operator told me that Garmin was aware of a bug affecting not all but many F5 units and was responsible for the heavy draining of the battery. He told me that it’s not a hardware related issue so it is pointless to return it, and that i just have to be patient and wait. When i replied that this device is available since more than 1 year and this should be enough patience for a bug so serious, he just told me that there was nothing he could to.

So I took a look at this forum, but except some poeple complaining, didn’t find case so severe as mine.
I’d like to know if this is really a known bug and if Garmin is actually working on that.
Also it would be helpful to know in there is other people on the forum with my same issue.

Thanks