Ability to unindent / deindent / reindent blockquotes text with 3.38+

I am using version 3.38.1 on Fedora 33.

Prior to version 3.38.x, it used to be that if you hit Backspace while at the beginning of the line of a blockquoted text quote, it would deindent one level. Now, instead, it removes one line above the quoted part, which is fine and makes sense to me (it kinda feels "safer" that way, I think)... except that I don't have a way to deindent a blockquote anymore, which is something I like being able to do when selective-inline-replying to an email that is a couple of replies deep. For example here the isolated quotes are still three-levels-deep, and I'd like to make them simply one-level:

While placing the text cursor in the blockquote, the toolbar's text indent button is sensitive, but the unindent button is insensitive. Ideally, it would be fantastic if the unindent/indent buttons could be used to adjust the quoting level of the paragraph corresponding to the current line where the cursor is, or of the current selection while within the confines of a blockquote element.