i.redd.it Not working if link is to thread rather than direct to image file?

Grabbing a couple example off r/all right now:

This works:

https://i.redd.it/x089t8ggl06z.jpg

https://www.reddit.com/r/Tinder/comments/6jm2l1/kind_of_proud_of_this_one/

This doesn't: https://www.reddit.com/r/funny/comments/6jmo02/thank_you_reddit_for_making_my_dads_day/

https://www.reddit.com/r/funny/comments/6jmo02/thank_you_reddit_for_making_my_dads_day/

Seems to have just started today. Change in how Reddit does it? I don't know how users submit images in the 2 different ways above, the Reddit image UI is the same regardless of sub right?