You forgot to give your big media box a transparent pigment-- rgbt 1. Otherwise,
when the camera is outside of it, it sees a 'solid black' opaque box, the black
most likely being v3.7's default black pigment. (The v3.8 betas changed that to
white, btw.) When the camera is inside the box, it has no black walls to look
through, and sees the media anyway.

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