Steps to reproduce:
1. Clean installation of Ibexa DXP 4.2
2. Create content with RichText field (e.g. an Article)
3. Edit RichText field using Numbered List or Bulleted List options (e.g. "square" for bulleted)
4. Save/Publish this content.

Result:
Bulleted List backs to "disc" option

Expected result:
Formatted list preserve selected option ("square" in that case)