How to reproduce:
- create a wiki
- install standard flavor
- change the color theme of the wiki
- go to the administration of the wiki in the extension manager and look for the standard flavor
- from the extension menu, next to "uninstall", choose "Compute changes"
- the page XWikiPreferences should appear with only one change, the color theme
- the page XWikiPreferences appears in the list with the color theme change but also with 71 properties changes
Most of these property changes are about the property number in the class.