Does FCP degrade 10 bit files/clips?

I'm not sure if this is troubling or if I just don't know how to export from FCP correctly.

I created a new Project in FCP: 10 bit uncompressed.

I then created a black to white gradient: The "A" button in the bottom right of the viewer > Render > Gradient. I now have a 10 second black to white gradient in my viewer WITH NO BANDING (at first I thought this was strange because I was on my cheaper, DVI, user interface monitor - but then I thought I was in B&W - with no color).

I then dragged the clip to the timeline. The same clip in the canvas window now has A LOT OF BANDING. OK, well it needs to play in real time right?.

So I then exported the clip 2 different ways. Once using "current settings" and once using "uncompressed 10 bit".

I then imported the clip and put in in my viewer. Now THERE IS BANDING IN THE VIEWER"?????????????

I can only think that 1 of 3 things may be happening.

1) I don't know how to export a clip correctly.

2) FCP processing is degrading the image... quite a lot.

3) Or when it exports it actually is converting it "in color" even thought it still looks B&W. (Could someone with a 10 bit monitor test this?)

I did import the clip to Resolve and on my 10 bit monitor I see the banding...

What do you all think of this? I heard that FCP can import 10 bit but when it does processing, it can only do it in 8 bit. Although I'm not sure why that would effect this here since it's luminance only.