Open Mixer bug (Embed link)

For a few weeks now, there is a bug with the HTML embedded version of a score. As soon as we click the open mixer button, an error freezes the UI and prevents us from using the mixer or any buttons afterward. Here's a console cut & paste of the error :

Uncaught TypeError: Cannot read properties of undefined (reading 'paywall')
at jmuse_embed.87624d9ee184641e50f145e78f889898.js:2:51227
at ce (7712.ab30aaa960c320ed1fa015b0de5b6a8e.js:1:31363)
at jmuse_embed.87624d9ee184641e50f145e78f889898.js:2:48448
at Array.map ()
at jmuse_embed.87624d9ee184641e50f145e78f889898.js:2:48440
at e (jmuse_embed.87624d9ee184641e50f145e78f889898.js:2:4260)
at jmuse_embed.87624d9ee184641e50f145e78f889898.js:2:4465
at tt (vendor.8acfd5b4fe6054df21bfbb6cc240ed43.js:2:16363)
at t.useSyncExternalStoreWithSelector (jmuse_embed.87624d9ee184641e50f145e78f889898.js:2:4535)
at vendor.8acfd5b4fe6054df21bfbb6cc240ed43.js:2:34268

Can anyone help? Where is the best place to submit that for review? Here? GitHub? Thanks!