Currently, the proof PDF is discarded if there are any changes to the manuscript files, even if those changes would not have modified the proof PDF (e.g. uploading review files, marking files Ready for Batch). For proofs with large numbers of high resolution images rebuilding the same PDF over again may take a considerable amount of time and use up computer power on Clarivate's end that I assume they'd rather not have to pay for. How about the proof is left alone unless there's a change to a file that's marked as being in the proof?
