It predicts long term consequences on health. Not immediate ones. You wouldn't have noticed at all. Unless you measured your heart muscle weight.

It's good to work out. Perhaps it offsets any loss.

I get that it's upsetting and might contradict what you think.

At this stage we don't know for sure. It's something you might want to keep in mind. Especially if you take this drug without working out.

If someone is taking this medication for the right reasons, the risks of taking it are far lower than those associated with obesity and diabetes.

Also, concern of losing muscle mass on GLP-1 agonists (and diets in general) is well known and typically explained by the responsible MD to the patient.