In the latest beta, a quest has been added, that confirms the number of lanes on a road. After submitting an answer, the road is then marked as having a bridge, and asks the bridge height. No bridge exists, so this shouldn't happen.

The question is "below" the bridge. So parts of your highway is below another osm way.
Can you add the location?
Sorry, I was wrong. I had exactly the same with the very short
https://www.openstreetmap.org/way/34371411/history
This is a bug. No crossing way in this case. So no powerline problem.
Leaving the app hides the maxheight quest again.
Well I think it might show up unintentionally in some cases, for example for powerlines. But I'm not sure what triggers it.
Tested again with https://www.openstreetmap.org/way/412501832/history
Reverted the wrong entry.
This is the situation:
Bugfix update will come today.
Most helpful comment
This is the situation:
Bugfix update will come today.