If you are playing as a support (healer) hero in Overwatch 2, you may find that as you go into the next round of the match, the health bars of your team no longer show. It will only show when they are critically low on health.
Solution: Change to another hero and then change back to your main character.
The healthbars will now be restored.
This bug has been around for quite some time and has not yet been fixed, but the above solution works every time.