[xwiki-users] Page Administration: Rights: Page & Children

Hello, I have a problem to set up the right page permissions (or may be I have a understanding problem ... ) using XWIKI 9.3 I want to set up access permissions to a certain page and to all children of this page. - A group "XWikiAdminDocumentation" was created. - A page "Administration" was created to be filled with documentation for administrators only. - Only members of group "XWikiAdminDocumentation" should have access to page "Administration" (and all coming child pages of "Administration"). - At page "Administration", menu "Administer Page - Users and Groups - Rights: Page & Children" I set up the following permissions: --- ALL rights to groups "XWikiAdminDocumentation" and "XWikiAdminGroup". --- NO rights to groups like "XWikiAllGroup" and "XWikiGuests". --- Please, have a look at the attached screenshot (sorry fort he "German screenshot" but the screenshot should be self-explaining I hope). - The problems are: --- First thing: As an administrator I can't forbid the right "Admin". Yes, I can disable this right. But if I open the menu "Page Administration: Rights: Page & Children" a second time the former set right "is lost" (see screenshot). --- Second thing: Despite oft he defined page permission rights a user of the group "XWikiAllGroup" kann read and edit the page "Administration". Much worse, this user can also open the "Administer Page" menu and he can change the permissions. I found no corresponding exceptions in the xwiki.log, therefore, from a technical point of view every thing seems to be okay. Now, I have no more ideas what elso to do :( Kind regards, Thomas