Impossible to manage rights on latest XWiki versions

[petrenkonikita112263]

Prerequisites:

• XWiki 16.9.
• Latest version of pro extension.
• Trial license

Step to reproduce:

1. Create a new forum
2. Try to set specific rights for Groups or Users from Page Administration (or via keyboard shortcut r)

Actual result:
It's not possible to set rights anymore due to the absence of checkboxes

Expected result:
Users can manage rights by setting permissions at the forum's page.

Notes

I can't reproduce the issue on the minimal supported version of XWiki 14.10 or LTS version 15.10.15 (the version on the reported date).