The sharing source icon is a "question mark"

I was having problems with WebDAV and sharing settings the other day due to the following failure.

Since then, the “shared source icon” has become a question mark.

This question mark icon is only available when the source of the share is the Group. If I share directly with the user, the account icon and acronym will appear without problems.

Is there a way to fix this icon if it is shared with a group?

CentOS 7.7, Nextcloud 19.0.1, PHP 7.4.8, Nginx 1.16.1, MariaDB 10.2.32