Dear Kurt,
There is an on-going incident SP986310 "Some users aren't receiving accurate search results for managed properties within SharePoint Online sites" related to the SharePoint Online file search performance have been being investigated by the related team.
The issue doesn't happen in all tenants. Some users in some tenants are affected.
The issue needs to be fixed by the related team directly. Sorry for that we may have limited resources on fixing it.
To fix the issue as soon as possible, I suggest you contact the administrator in your school (If you aren't the administrator) and let him follow the steps in Get support - Microsoft 365 admin | Microsoft Learn to open a support ticket to our related team as soon as possible.
About admin roles in the Microsoft 365 admin center - Microsoft 365 admin | Microsoft Learn
How do I find my Microsoft 365 admin? - Microsoft Support
The administrator should be able to open the support ticket from Help & support in the Microsoft 365 admin center.
Then you can select the Phone support or the Email support as follows.
Your understanding is highly appreciated.
Sincerely
Cliff | Microsoft Community Moderator