I’ve noticed a few problems exporting ProRes files, including ProRes LT.
The file size is mysteriously 3-4x larger when exporting as ProRes LT. I often re-encode with the EXACT same settings in an NLE or Media Encoder to ProRes LT again! and the file size drops to 25-30% of the original? (I suspect a bug as the data rate is equivalent to ProRes 4:4:4 not LT!)
Leaving the encoder audio settings on auto will often copy the original audio stream, such as AAC, AC3 etc. This is not compliant with the ProRes specification (uncompressed audio) and will cause issues when editing in another application. This needs to be fixed and forced to transcode to uncompressed audio that is compliant with the ProRes spec.