Quality loss from FCP to Motion

Hi there!
I'm getting a quality loss in the form of compression-based square artifacting when I send a piece of lossless footage to Motion from FCP. If there's a loss everytime one sends files, why would anyone use it? Does anyone know how to keep the footage lossless while sending between apps?
Thanks!

Patrick, thanks so much for your help. You're all really helpful on here!
Exporting in prores still displays artifacts and they show up when I bring it into FCP (regardless of whether I import the clip fresh or have it saved back from a "send").
Here's what I tried:
importing clip directly into a new motion file (not sent from FCP) - movie displays with artifacting - upon rendering, rendered clip still has issue - imported into FCP - still shows artifacting
by importing the motion clip with artifacts into FCP and display in the timeline, FCP changes it's settings to match the clip as usual - I then tried importing the original source clip directly into FCP and when I move it to the timeline, it also shows identical artifacts. However, if I bring in the original clip first, so FCP changes it's settings to match it, the motion clip still shows compression.
Assuming the problem is with the transcode, is this just an issue with this video format working with motion? If so, I assume this means our video team needs to use a different codec. We're shooting a lot of green screen for HD video - any recommendations for a better codec?
Also, is this an issue that Apple can address with future versions of Motion?
Thanks again!

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