Describe the bug
When re-editing content that has sub-lists in it, the sub-lists disappear, although they are correctly saved in the database.

Probably related to the latest Quill changes we've done. When reporting this I tested this in nightly and it does not seem to have this issue, so it is likely related to #9640.

To Reproduce
Steps to reproduce the behavior:

1. Go to admin panel -> Pages
2. Edit some page
3. Add a list (ordered or unordered) with some sub-items in it
4. Save the page
5. Go back to edit that page
6. See sub-lists have disappeared

Expected behavior
I would expect to sub-lists to persists.

Screenshots
On first edit:

When coming back to the view:

Stacktrace
N/A

Extra data (please complete the following information):

• Device: Desktop
• Device OS: Ubuntu 22.04
• Browser: Chrome
• Decidim Version: develop
• Decidim installation: ?

Additional context
Possibly related to #9640.