Hi, have that bug and it's cause by buff or debuff icon on the health bar.
With the new update you can assign new keybind specific on icon.
This make me unable to click to heal everywhere there a icon on those health bar.
This is making it difficult and specially hard on tank that have a lot of buff and debuff.
Making me use only 2/5 to 3/5 of the health bar sometime due to having too much icon. i re-install the previous version with the new raid coming it's making me miss to many heal.