Did something changes with regard to :bind-prefix keymaps in use-package?

I used to have this in my function declaration : :bind (:prefix "C-j" :prefix-map avy-map :prefix-docstring "Counsel" ("j" . avy-goto-char) ("g" . avy-goto-char-in-line) ("w" . avy-goto-word-1) ("e" . my-avy-copy-word) ("L" . my-avy-just-copy-line) ("l" . avy-goto-line)) but as of this morning (emacs 28.1.50 with packages-update) this didn't work anymore and I am not sure how I broke it. Googling and debugging around I could make it prefix-map work via use-package like this : (:prefix-map my-avy-map :prefix "C-j" :prefix-docstring "Counsel" ("j" . avy-goto-char) ("C-j" . avy-goto-char) ("g" . avy-goto-char-in-line) ("w" . avy-goto-word-1) ("e" . my-avy-copy-word) ("L" . my-avy-just-copy-line) ("l" . avy-goto-line)) :bind-keymap ("C-j" . my-avy-map) I am just surprised this broke (nothing breaks on emacs usually :D) and I am not sure if it's still the right way

Did you try searching the use-package repository's issues? That and the actual source of the library would be the first two places I'd look.