This is still ongoing and version 1.73.89 broke things even worse for me. Now clicking the Retry button does nothing at all. See my message here: Brave keeps resetting my Leo Premium model to Mixtral - #7 by Tritonio
EDIT: I reverted to 1.71.123 and now the retry button for Leo works again. I’ll try to go forward gain to 1.73.89 and check if it breaks again or if it was one time thing. I’ll edit this message again.
EDIT2: I installed 1.73.89 again and yes the button is definitely broken. Also notice how quickly I can do these tests, because Leo network-fails practically every time I try to use the improve text functionality on a page and I need to click retry a bunch of times to get a reply. 