oh, i thought it was on this thread, but it’s actually over here. YMMV:
https://wordpress.org/support/topic/feed-missing/
oh, it turns out my https problem was that my dummy post was not showing up over https, so it was an extension of the root problem.
@beherit, just curious, did you try applying the patch mentioned for wp-core?
@ravanh I’ve noticed that this error also occurs when using slugs and https. In addition, the feed-podcast.php references some xmlns that are either not available via https, or are completely 404. Is there some fix we can apply to feed-podcast.php to make the slugs work over https? Thanks!