No tinted background for quote and verse

I recently switched from using modus-themes-org-blocks set to 'gray-background to tinted-background and I noticed that verse and quote blocks in Org mode are not highlighted, i.e. don't get a background like code blocks do. I have org-fontify-quote-and-verse-blocks set to t and ran org-mode-restart.

From #68 (closed) and #190 (closed) I understand that those blocks used to get a coloured background when the setting was still called rainbow, so I guess this is a regression.

When I start emacs -Q and evaluate the following code in my *scratch* buffer, I get the picture below.

(require 'package)
(add-to-list 'package-archives
             '("melpa-stable" . "https://stable.melpa.org/packages/") t)
(add-to-list 'package-archives
             '("melpa" . "https://melpa.org/packages/") t)
(package-initialize)

(add-to-list 'load-path "~/.emacs.d/elpa")

(use-package modus-themes
  :custom
  ;; Add all your customizations prior to loading the themes
  (modus-themes-org-blocks 'tinted-background)
  :config
  (load-theme 'modus-vivendi :no-confirm)
  )

(use-package org
  :custom
  (org-highlight-latex-and-related '(native
                                     script
                                     entities))
  (org-fontify-quote-and-verse-blocks t)
  )

If I switch modus-themes-org-blocks to gray-background, the quote and verse blocks do get delimited:

This is with Emacs 29.2, Modus themes from melpa, dated 20240104.1122.

Any help is appreciated!