When playing on all control maps as a support hero, allied health bars become hidden when advancing to round 2 and/or round 3 without switching hero. This issue occurs in all forms of the control game mode, including competitive, quick play and arcade.
Switching to a different hero causes the health bars to become visible again, at which point the player may switch back to the same hero as a temporary fix until the next round, when the issue will occur again.
Forgetting to swap hero at the start of round 2 or 3 forces the player into sacrificing ult charge upon respawn if they wish for the allied health bars to become visible again.
The issue seems to have been present since Overwatch 2 launch.