Just recently (last couple of days/weeks), I noted that I can no longer change the exercise name and save the changes in Garmin Connect Web, whenever the exercise has no weights attached (e.g. sit-ups w/o extra weights or body-weight dips). I can however change all other exercise names online and save.
As soon as I change one exercise w/o weights, I can no longer save the changes made.
In the Garmin Connect Android app, I can however change all exercises w/o problems.
I'm using my Fenix 6X Pro (probably not relevant)