Does FCP assume interlaced video if frame size happens to coincide with PAL?

I have a QuickTime MOV file that has a frame size of 720x576, at 25 fps. It's actually a series of full-frame JPEG images, so it's progressive video.
When I add it to the timeline in FCP-X, it shows up as PAL 25i - ie. FCP thinks it's interlaced.
My timeline is PAL 25p, so the source video is being de-interlaced by FCP when it shouldn't be, which is leading to image quality degredation.
Is there any way to stop FCP from assuming this progressive video is interlaced?
Thanks,
Rob

Hi,
MJPEG is simply a series of JPEG images. If you pull one apart in a hex editor, look for the bytes that start with 0xFFD8 - this is the JPEG Start-of-Image marker. Extract that section, until the following JPEG End-of-Image marker (0xFFD9), save it as a file, give it a .JPG extension  and voila, a fully standards compliant JPEG image.
Images I know about - it's video that's foxing me!
The incoming video is an arbitrary size - I could make it 512x512 for example. If I do that, and leave everything else the same, FCP treats it as *progressive*. It's only the 720 x 576 file that FCP is *assuming* to be interlaced.
Here: a 512x512 mjpeg.
On the timeline - note, FCP does *not* assume it's interlaced this time:
I know the 720x576 file isn't interlaced: it's a series of full frame images.
So: any ideas how I tell FCP to stop treating the input as interlaced?
(Many thanks for your assistance by the way, it is appreciated.)

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