Widget Interaction Component (Mouse) not working in VR

Development Platform & Builds XR Development
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1

Since Unreal 4.17, Widget Interaction Components don’t trigger any hits in VR mode, if their source is set to “Mouse”. (Tried with Oculus CV)
I have tried with a fresh project that did work fine in 4.16, here are the steps to reproduce:

  • Create a new project based on the FPS / C++ template
  • Add a Widget Interaction Component to the FirstPersonCharacter, leave the defaults but set “Interaction Source” to Mouse. (optionally enable Debug)
  • Create a WidgetBlueprint, remove its Canvas and add a Button. Add some hover effect to the Button (e.g. Tint color).
  • Create an Actor Blueprint with a Widget Component. Set its widget class to the new widget and place it in the scene.
    Play in VR mode → works in 4.16, when upgrading the project to 4.17 or creating it in 4.17, no hover effect is visible and the debug gizmo does not display.
2

I noticed that when playing a cooked build, the cursor appears but still seems to be a bit offset, depending on the viewport size. Might this be related to UE-47210? It still requires a huge testing effort for every UI change in VR (i.e. creating a build).