I'm not sure why or how PPro is inserting frames from a different clip. But before digging into that, it might be worth exploring why you're using Interpret Footage to change the frame rate. In case you're not aware, Premiere Pro manages mixed frame rates automatically, so you don't have to do anything if you want the 30fps clips to play at normal speed in a 24fps sequence. In fact, changing the frame rate changes a clip's duration and playback speed.
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