Load significantly less for similar effort activities since 19.10 update

Same issue. Loads are way lower than before and training load all wrong. Now everything is RECOVERY

I noticed a huge change today. On June 10, I did a 24 km ride, 529 meters vertical, with aerobic effect 3.8 and anaerobic 3.2. Today, I did the same ride, slightly faster (1.10 vs 1.13). Aerobic effect today of 3.2 and anaerobic 1.0! Runalyze gave today's ride a TRIMP of 83 vs 126 in June. My exercise load in June was 258. Today, it was 111, for the same ride, same intensity. These numbers, esp. anaerobic, are not possible as I am in basically the same condition today (VO2 max 46) as in June. Oh yeah, average heart rates were almost the same.

No. It is unchanged.

Intensity minutes seem to be in line. It's the load calculations and training effect (aerobic, anaerobic) that are way down for the same workout as before.

My ride today was rated at (from memory) 22 moderate and 40 vigorous, plus some easy time. Seems about right. Rated as a Tempo workout. But my exercise load and aerobic/anaerobic numbers are way off -- too low.

Please report the issue to Garmin! The more cases they know about, the more they escalate the issue. I spoke to them on Thursday & they said there’s my case & one other with this problem that’s been reported. I have no training status now as it’s been over two weeks since my runs have been properly recorded. 

Yeah, the calorie calculation is way off too. Same activity, more or less, same distance same general effort/heart rate and heat outside last week was 382 today, 521 last week. Similarly, I noticed the rowing machine gave me 300+ calories for a workout (which seems right, it's similar to other similar workouts according to both watch and machine previously) and the watch had way, way lower at 191 calories.

It's absolutely busted.

I was recently updated to SW 19.2 and had the same problem.  Virtually no intensity mins, no training effect or load.  Very frustrating.  I was going to revert back to 16.7, however your watch will revert back to the default setting.  I decided to reload 19.2.  Downloaded it, put it in the correct folders and when it rebooted, everything seems to be back to normal.  I only did 1 indoor bike ride, but my numbers were very similar to 16.7.  Don’t know if it would work for you, but I don’t think it would make it worse.

I did a cycle route today that I've done four times before, so I could compare. Two of the times the temperature was significantly higher (28C and 29C vs 21C today) so that may account for significantly higher calorie counts on those rides. Otherwise, the only physiological change of significancs is that my anaerobic training effect was higher in all previous rides (around 2.5) compared to 1.5 today after the 19.20 upgrade. I had noticed an even larger downgrade of anaerobic effect on a ride yesterday when compared with a previous identical ride (1.0 vs 3.2). Calories, heart rate and aerobic loads all seem reasonably close. But there were two non-physiological differences that stood out -- distance, which varied up to 0.7 km over a 20 km route, and elevation gain/loss, which varied up to 40 meters over a 270 meter total gain.