Reddit Downloader Fails At Grabbing A Lot

When using the downloader for Reddit, it does not seem to grab anything.
It seems to fail at parsing many videos, and images.
It also does not seem to grab the entire subreddit, but only a few (pages?) worth

Start by locating the Reddit downloader and reproducing the reported failures with posts containing videos and images. Check how subreddit traversal handles multiple pages, then verify that media is parsed and the full subreddit range is processed; done means these cases no longer produce empty or incomplete downloads.

Written by the indexing model from the issue text.