Recently there was a change in the quote feature.

Previously, when quoting a post that had already quoted many previous posts, you could delete the content and delete the quote box by clicking inside that box, then clicking on the "Quote" button at the top of the message field. This made it easy to quote a post without having a box with 10 other quote bubbles.

After the last site update, that isn't working. You can delete everything except 1 quote box. How do you get rid of that last box?