Hyperlinks to Reddit within Chat do not work on app

Links to comments within Reddit in the form of:

https://old.reddit.com/r/cats/comments/1tzs632/he_looked_comfortable_so_legally_i_had_to_buy_it/oqd5a2z/

Are redirecting to the front page of the subreddit (so in this case, /r/cats). This has broken one of my bots for my users.

To reproduce the bug, send a link like the one above in Chat, either as a full URL or shortened with markdown, then click on it from the iOS app (might also be an issue on Android)