Problem:
Plan regions are problematic they simply don't always work they way they should. I try to avoid them when possible. The most common plan region is added to show a high wall opening, which often requires managing several plan regions, which tend to get hidden or deleted or don't move with corresponding wall or etc.
Solution:
A "show all openings in wall" property toggle. This would allow all openings in a wall to be shown in plan and would ignore the view range cut plane. It would be good if the feature could be view specific or universal, although I cannot think of an instances where I would only want it to be view specific.