Here are a few more symptoms I have found. The following declaration works in both Emacs 27 and 28, but the one below only works with Emacs 27 but does not work with Emacs 28.

(use-package doom-modeline
  ;; Requires the fonts included with `all-the-icons', run `M-x all-the-icons-install-fonts'
  :ensure all-the-icons
  :ensure doom-modeline
  :if (eq sb/modeline-theme 'doom-modeline)
  :commands doom-modeline-mode
  :demand t
  :init
  (setq doom-modeline-buffer-encoding nil
        doom-modeline-checker-simple-format nil
        doom-modeline-indent-info nil
        doom-modeline-lsp nil
        doom-modeline-minor-modes t
        ;; Reduce space on the modeline
        doom-modeline-buffer-file-name-style 'file-name)
        :config
  (doom-modeline-mode 1))

(use-package doom-modeline
  ;; Requires the fonts included with `all-the-icons', run `M-x all-the-icons-install-fonts'
  :ensure all-the-icons
  :ensure doom-modeline
  :if (eq sb/modeline-theme 'doom-modeline)
  :commands doom-modeline-mode
  :init
  (setq doom-modeline-buffer-encoding nil
        doom-modeline-checker-simple-format nil
        doom-modeline-indent-info nil
        doom-modeline-lsp nil
        doom-modeline-minor-modes t
        ;; Reduce space on the modeline
        doom-modeline-buffer-file-name-style 'file-name)
  (doom-modeline-mode 1))