After updating to Premiere / Media Encoder 2021 (v 15) there are problems reading the rendered .mp4 files. On Mac/Safari/Quicktime and iPhone/Safari, if scrubbing the audio disappears, while letting it play, the sound goes out of sync. The same files read via Vlc on Mac are fine. In Windows environment the problem does not exists. The same projects rendered with the previous version (2020) are read correctly... ideas?