when both files are on the same timeline, ProRes Raw or BRAW have issues being together. time line stalls or crashes often. when exporting is even worse, 75% of the time nothing happens and it hangs. this happens everytime regardless of which system i am using.
When it works, it works fine, but otherwise, constant restart of premiere is a must. to get around, its best to export file with raw setings to prores 422 and import to timeline and keep working, this seems way to redundent.