The F3+D feature doesn't work.

I was playing 1.14 and I wanted to clear chat. I executed F3+D and nothing happens. I tried checking if the chat box was open while I did it, it wasn't but it still didn't work. All that happens is that the F3 menu appears and the client acts like I didn't hold down the "D" key with the "F3" key. 

Note: I have found another Issue relating to my problem, but it did not fix it.

Thank you, Scrumqty