No LTHR update

I use this old topic to say that I have this problem now with my f7Pro after the 21.19 update. Despite having automatic detection I only see a wrong Bpm data without seeing the “pace”.

I also have the problem and not LRHR update.

the detection problems continue, despite the 2 fw updates released and hard resets I have done, the San detection (even fcmax) are not calculated: when I used to put (for testing purposes) a manual value of anaerobic threshold bpm and then re-enable "automatic detection," the next run (whether it was "base" or "anaerobic threshold" was the same) I would get the value in bpm and pace...
I have a fenix 7 pro

Garmin-Laurie The document linked in your post says on the last paragraph: 

Can I Input My Own Lactate Reading?

A manual reading can be input on your watch within your user profile under heart rate zones on the device. This will however turn off the auto-detect option and your device will ignore any future readings with this setting turned off.  

How can we turn on again auto-detection after a manual entry?

user profile - heart rate/power zone - automatic detection, however I tried all combinations, nothing changes, detection is buggy

Yes, still buggy.

FWIW I'm using a Fenix 7S Pro Solar on the latest (non-beta) software and still get LTHR auto detection. In fact I got it yesterday. It's true that there can be gaps - longer spells where it doesn't update. It may be that the specific conditions required to cause a recalculation are too strict, meaning that it's not triggered often enough. I'd certainly like to see a definition of what conditions are - and I think the manual LTHR test should be re-instated to help guide people.

Same experience for me F7Xss 22.06

no updates since weeks, last end of april, then update end of may, and yesterday. But i was sick and the update are lowering the value, which for me normal behaviour.