Wiki icon is not properly proportioned and bullets are displayed in page tree nodes on email notifications on Microsoft Outlook

STEPS TO REPRODUCE

Preconditions: The XWiki instance has the Mail Sending configured. An user (e.g. U1) is created and has a valid e-mail address set on its profile (e.g. a Gmail one).

1. Configure Microsoft Outlook (I've tested with Microsoft 365 package version 2014 - 16.0.13929.20206) with the email account used by user U1
2. Login as user (U1)
3. Go to Notifications > Settings and set all Pages Notifications to ON (both menu and email)
4. Watch the wiki
5. Login as Admin
6. Create some pages (e.g. each with Home page as their parent)
7. Trigger the 'Notifications daily email' job from Scheduler.WebHome
8. Go to Outlook and observe the mail received on the user's account

EXPECTED RESULTS

The page tree structure has the small wiki icon (in the left of the wiki name - Home) proportioned with the font size. Also, the nodes of the page tree are single intersecting lines.

ACTUAL RESULTS

The small wiki icon (from the left of the wiki name - Home) is larger than the font size and on the page nodes some bullet points are displayed.

Please see the attached screenshot from Gmail web client for comparison.