Missing Captions when using Media Enocoder

I’ve been having trouble with Premiere Pro and Media Encoder. When I export videos, subtitles don’t appear, even when I select them and “burn in” the subtitles. This issue affects multiple videos I select to export them from different folders in my project (videos from one folder will have captions and from another one will not) and occasionally with single exports but only when I use Media encoder. It’s been going on for months and hasn’t been resolved.