Just to make things much clearer (and remove user error part of my first post...) I reedited this opening post, and made a summary of the bugs in SW version 2.10. For more detailed descriptions, see later posts. Please contact Garmin support as well with your discovered bug. I consider this forum as a knowledge base for users, but sometimes Garmin support reads it as well:
(last edit 07.01.2020)
- if stopping and resuming pool swim recording while auto rest function is on, and in auto rest detected state (black background), the auto rest function does weird things (seems that in FR945 public beta 3.77 corrected, in Swim2 2.20 beta it is definitely corrected)
- Sleep tracking - REM sleep is not recorded - honestly I do not use activity tracking, but for the two tracked sleeps I did not see REM either (in 2.20 beta REM is recorded)
- HR zones can be set only for swimming but not bike/run/cardio
- auto lap can be set for OW swim only for 0.5 km or miles, can not be changed to individual distances
- In history, when browsing intervals, first page correct (intervals 1-4), then next is intervals 5-8, but if you browse up to 1-4 and back to 5-8 it changes to intervals 4-7. You still can browse between 1-4 and 4-7. If you browse further down, suddenly you lose the first 4 intervals. But it depends of the actual number of intervals, and the interval history can go a bit mad. (very similar issue can be read for Forerunner 45 as well, see FR45 forum, bug reports after 3.10)
- last length pace data field displayed 0.01 during swim. (seems that in FR945 public beta 3.77 corrected, in Swim2 2.20 beta corrected)
- Auto-rest + count-down not creating intervals (Garmin recommends to NOT use countdown and autorest feature together - see online documentation)
- Personal record saving do not support 33 and 1/3m pools. With 33 and 1/3m pools, 3 lengths are not considered as 100m, but something very close, but not EXACTLY 100m. Wth this bug the watch can not recognize the laps as exact lengths, causing not record saving.
- extrem long interval appearing. This might be connected to auto rest, but not really sure. Really rare issue, but annoying when happens. Fault reproduction is not possible so far.
- auto lock does not work
- backlight control is faulty. "During activity" and "not during activity" are not separate options, they are connected somewhat. You either turn off backlight completely or turn it on completely, but can not separate the behavior depending on activity or watch mode.
- Open water swim can be saved only in case an extra LAP is recorded.
If you start an open water swim, and do not use the LAP button, only a start, and at the end a stop, the activity can not be saved or discarded. Every try of saving/discarding results in an immediate restart, the watch resumes back to the activity. The only way to end this loop is to press the LAP button (new lap started), and after that the activity can be saved/discarded. I did not test it with auto lap feature.
I found this bug in 2.20 beta