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I wanted to say that the quick edit seems to be working now, but I think I jumped the gun. The "save changes" button is clicked. The message seems to update. But the changes are not applied.
More precisely, I did this: I went into advanced mode, added some text with a quote to the message, saved the changes -> the changes are not visible in the message text.
I went into quick edit mode, opened the message -> I see the changed text inside the edit window.
I click "save" -> nothing happens again.
See the previous message, plus screenshots from this one.
Configuration: updated Firefox, Win10, 1920x1080
Added something to the message.
Added something else to the message.