Yes, here too. I found the way to reproduce. Using latest Chrome and XF 2.2.7.
So type a word and then leave the cursor there and select a giphy so it ends up on the same line, so the text is pushing the giphy out. Now, you want to move it to the next line so you move the cursor to after the word (before the giphy), and press Enter. It creates a new line in between and no matter what you do, you can't get rid of it unless you enter bb mode.