BP supporting SxS not working in packaged game

I’m collaborating with OWL (Off World Live) to add support for SxS output as part of their Livestreaming Toolkit. The BP behaves as expected in Play mode in Editor, providing controls for inter-axial, convergence, and fov of a stereo camera, at last a sophisticated tool for delivering a responsible stereo template. The packaged game behaves in every respect except for not linking to SxS. The attached snip shows the node structure supporting Num 8 to switch between regular 2D and SxS.

Note, the Print String nodes between each step, each display during Play in Editor, while only some of them display in game, the triggers show, but not the result, e.g. the widget providing for the SxS, UW_SxSPreview_C_1 (not shown) doesn’t present in game with Num 8

Because a CineCamera defaults to Manual focus, and given the camera in the packaged game mirrors either of the stereo cameras in Editor that have focus disabled, this alongside the fov looking identical, it appears the left eye camera is in fact making it through Cook and Build. So why is SxS not making it through?

For anyone desiring standard SxS output, either into a 3d monitor or projector, OWL will soon be your friend in this regard. Many thanks for thoughts on this question.