Sorry about that! I have a similar system and can test that for you. I'd need some sample footage, though. Let me know if you can upload a sample clip, and I'll test it out. If you cannot provide a clip, I'll ask engineering if they have a sample clip I can test with. Hope to help you!
For clarification, are you trying to import a Composition from an After Effects project into Premiere Pro or are you trying to import an Image Sequence rendered from After Effects into Premiere Pro?
Are the MXF files from the Canon C300mk2 10-bit AVC 4:2:2 C-LOG 2 or C-Gamut? I'm currently working on an indie feature film that's mostly Canon CRM files (Canon Cinema RAW Light format). Even though Premiere Pro supports the Canon format, converting everything to Apple ProRes 422 HQ made working in Premiere Pro extremly responsive and made it very easy to go back and forth between Premiere Pro 2023 and After Effects 2023 under macOS Monterey 12.6. Sequence Video Previews in Premiere Pro were also changed to custom QuickTime Apple ProRes 422 HQ. Convering your footage to ProRes could help with your workflow as well.