[Bug]: For group admins: Groups in user list missing

[bentuna]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

A group admin can see all accounts that are in at least one of his administered groups under /settings/users.

In the list of accounts/users the column "Groups" ist empty. The group names appear after clicking the pen icon at the end of the line to edit one of the accounts.

Steps to reproduce

1. Log in as an account that has group admin privileges to one or more groups but is not in the admin group (so doesn't have full user management privileges).
2. Navigate to /settings/users/
3. See how the column "Groups" of the accounts list is empty
4. See how the group namens in the column "Groups" appear after you clicked in the pen icon at then end of the line to edit one of the accounts.
5. See how the column "Groups" is empty again after realoading the page.

Before	After clicking "edit"

Expected behavior

The column "Groups" should always show the groups that the rspective user is part of and the viewing user is a group admin of.

Nextcloud Server version

32.0.9

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

[bentuna]

Not sure if related, but there is a JS error when clicking on the "edit" button:

[ERROR] settings: Failed to load sub admin groups with details 
Object { app: "settings", uid: "bentuna", level: 1, error: AxiosError }
​
app: "settings"
​
error: AxiosError: Request failed with status code 404
​
level: 1
​
uid: "bentuna"
​
<prototype>: Object { … }
​​
__defineGetter__: function __defineGetter__()
​​
__defineSetter__: function __defineSetter__()
​​
__lookupGetter__: function __lookupGetter__()
​​
__lookupSetter__: function __lookupSetter__()
​​
__proto__: 
​​
constructor: function Object()
​​
hasOwnProperty: function hasOwnProperty()
​​
isPrototypeOf: function isPrototypeOf()
​​
propertyIsEnumerable: function propertyIsEnumerable()
​​
toLocaleString: function toLocaleString()
​​
toString: function toString()
​​
valueOf: function valueOf()
​​
<get __proto__()>: function __proto__()
​​
<set __proto__()>: function __proto__()
index.mjs:47:17
    log index.mjs:47
    error index.mjs:65
    loadSubAdminGroupsDetails UserRow.vue:608
    toggleEdit UserRow.vue:989
    VueJS 4
    toggleEdit UserRowActions.vue:64
    click NcActions-BcLis_nr.mjs:724
    VueJS 4
    click NcButton-BaZAY-tN.mjs:285
    VueJS 33