My plane was being culled when it reached a certain closeness/distance from the camera. Which is ajustable in the camera’s “Object data properties” >lens> “Clip start” and “Clip end”
The “Clip end” needs to be very large, say about 1000 m.
I’d suggesta “Clip start” of 0 just to makesure the plane doesnt cut off underneat the scene either.