Rendered areas of the timeline 'forget' their renders when subtitles are used. I've seen this now for months on a feature that is fully substitled. I've tried renders as ProRes Proxy and as I-MPEG, makes no difference. Minutes - sometimes even seconds - after a timeline is fully rendered, the sections that are subtitled with the caption track have turned from green to yellow. Premier v23.1, macOS 12.6.2.