Realms Feed unable to post already captured screenshot

So I took a screenshot using the built in realms screenshot feature in the escape menu but didn't post it right away. Then I went to the realm feed and clicked "New Post" and tried to add the screenshot there. The problem is that when I click "Add Screenshot" it shows me all the screenshots I have including the one I just took, but when I click on it it goes back the the "New Post" edit screen but doesn't add the screenshot, so when I posted it it just had the default green background.

Expected result: When I click a screenshot that image is added to the post similar to what happens when you first take the screenshot. (shown below)

Actual Result: When I click a screenshot it goes back to an empty post edit screen without adding the image. (shown below)

How to reproduce: Go to realms and take a screenshot. Them instead of sharing it just click the x and then go to the feed. Once at the feed click "New Post" at the top right corner of the screen and then click "Add Screenshot." Finally click on a screenshot and based on what happened to me it won't add it to the post like it should.