ViewportGrid on SceneWindow only works after toggling helper view (F4) on the window

To reproduce:

  • Open the patch, SceneWindow will be gray
  • Click into the window
  • Hit F4, the scene will show up
  • Hit F4 to hide helpers again
  • F9 to restart, SceneWindow will show gray again.

SceneTexture is also not working.

Tested with 7.4 stable.

ViewportGrid.vl (72.8 KB)

Using it with AdditionalSceneTexture works.