Users and Groups mappings are not displayed after save

[ilieandriuta]

STEPS TO REPRODUCE

1. Go to Administer Wiki > Other > Active Directory
2. In Advanced Configuration section, set a mapping for User fields and a mapping for Groups
3. Click 'Save'

EXPECTED RESULTS

After save, the previously set mappings are displayed in their corresponding section (e.g. User fields and/or Groups).

ACTUAL RESULTS

The mappings are not displayed anymore:

Before SAVE:

After SAVE:

Environment: Edge 80, using a local instance XWiki 12.1 on PostgreSQL 12, Docker