Since Mojang has changed the way some blocks (like the end rod and fences) are displayed when used on the head slot already, I think they shouldn’t just only fix this, but actually modify this item to make it appear above the players head, so it looks like a hat!
Totally agree with what they put as ‘Expected Behavior’. Pretty sure 99% of players who care about this think you should be able to instantly hit someone after disabling their shield. This bug should be fixed as soon as possible because it heavily impacts PvP!