ProRes 4444 Footage with Alpha

If I export a ProRes 4444 alpha from motion (e.g an animated spinning star shape) it is exported with a premultiplied alpha by default, and I can't find any setting to change this to straight.

If I try to use this footage in Final Cut Pro X. Final Cut renders it incorrectly. It only renders footage with straight alphas correctly. I can't find a setting to change the alpha interpretation for the imported video

It seems a bit odd that the default export from one Apple Pro Software should not work by default in other Apple Pro software

Am I missing something?