This is bug. It seems caused by the value in A46.
After changing it to any other value without "GR", the search function back to normal.
I'd suggest you raise it to Microsoft. Hope it will be fixed soon.
Please contact your admin/IT department create a support ticket via Microsoft 365 Admin Center> Support> New service request.
Get support - Microsoft 365 admin | Microsoft Learn
About how to find the admin in your organization, you can refer to How do I find my Office 365 admin