UMG widgets aren't cleared when levels are swapped via 'open LevelName'.

If a level has UMG widgets, swapping to other levels (including the level you're already on) doesn't clear away the UMG widgets.

1: Open any project.
2: Create a new UMG Widget with a Button in the viewport.
3: Scale the button's alpha (under its Color and Background) to 50%.
4: In the Level Blueprint, create a 'Event Begin Play' node chained to a 'Construct Widget' node chained to an 'Add to Viewport' node.
5: Play the level.
6: Open the console and enter 'open Example_Map' or whatever the current level is called.
7: Note that another Button appeared on top of the original. Each time the Example_Map is opened again, the button becomes more visible because they're stacking on top of one another.

UE-88880 - Public Discussion

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