Anyone ever noticed this?
 
Say you've got a mid / side recording. Standard approach, so your right side track is a phase flipped duplicate of your left side track. Panned together, they null completely, panned apart, they don't, and with a mid track, they give you a stereo image.
 
So far so good. However, send the sides only to a bus. You can still hear them fine, as you'd expect. However, the EQ plot of the bus shows no analysis data.

I'm guessing this means that the analysis data is tapped off the track in mono in some way, as the plot you see is what you'd get if the two sides were panned together.
 
What do we reckon? Should this be called a bug?

Clue: Is said EQ "plot" usually two "plots" on the same graph or is it a single "plot"?
 
Hint: Try it with a "plot" maker that displays each half of a two track stream separately and see what can be seen.
 
Guess: The "plot" of your "sides" signal is being nulled, and this is normal behavior for a display that combines both halves of a dual track stream to present a single, averaged, graph of an signal's envelope.
 
 
HTH