100% repeatable bug - heart rate fails to track a few minutes into every cycle / bike workout
Go and try it anyone from the Samsung team and find out for yourself - I guess something you forgot to do before selling your new watch.
Galaxy Watch 4 BT 46mm classic.
If you perform a manual HR measurement during the workout it resolves the issue during that one workout session but it comes back every time.
Walking and hiking workout modes do not have this issue.
I have a similar issue with the Active 2. I know they have different OS. But it will fail to track my heart rate after I start walking. Good luck on getting that resolved, Also make sure you contact support your watch is only under warranty for 1yr. dont delay.