old.reddit.com is clearly beginning to rot:

1. The new Reddit seems to have a different markdown parser which allows surrounding unindented code with ``` lines. This doesn't render on old Reddit.

2. New Reddit seems to be saving links with escaped underscores and correcting for it at render time? I've started to see people posting broken links like https://example.com/some\_path\_with\_underscores when it should be https://example.com/some_path_with_underscores

3. Posts with multiple images sometimes don't work? I haven't been inconvenienced enough by this yet to investigate.