Drag in event graph does not work after touch event with breakpoint

Dragging in event graph does not work after touch event with a breakpoint. This issue persists after the PIE has stopped as well. But the issue is resolved when the project is reopened.

Regression:
This issue occurs in the 4.15.2 and the 4.16 preview in the binary builds
This issue does not occur in 4.14.3 binary build

1. Create a new project (no template or starter content needed)
2. In project settings enable the option "use mouse for touch"
3. Create a new Actor class blueprint > name it "Test_BP" > open Test_BP
4. Recreate the blueprint from screenshot_01 and enable the blueprint to work with player0
5. PIE and right click
6. Use right click to drag around the blueprint editor viewport
   Result: The blueprint editor viewport cannot be dragged around
   Expected result: The editor viewport can be dragged around

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