Hi Adam Jeff,
I went through your post carefully and as per the clear screenshots of showing the behavior of unstable Edit in grid view option missing situation from quick access bar. Hence, I tried to deploy some more tests on my side with various test tenants, but it seems like I can reproduce the same issue. And sometimes, click Files down arrow>Reload tab will reappear the Edit in grid view button while sometimes it will need multiple times of refresh.
In this situation, I'm afraid this issue could be a temporary server-side issue from Teams side instead of your tenants. Hence, it is suggested to submit via the in-app feedback so that the related Teams product development team can get informed of this situation and the range that it has been affected across universal tenants, and so they can update a fixed version as soon as possible to make a stable behavior of quick access bar in Teams. Reference: Give feedback in Microsoft Teams - Microsoft Support
Meanwhile, if you want to get urgent support to resolve this on you and your tenant side, I suggest that you raise a free support ticket from the Microsoft 365 admin center and report the issue to the escalated Teams online support team to get the proper and dedicated support. The support team there has more permission than community moderators here, they can help you remotely and collect logs to find out what exactly happened that caused the option loading issue. They may also involve more resources to investigate the issue from the backend. This would be the most efficient way to handle this situation for you and your tenant. Reference: Get support - Microsoft 365 admin | Microsoft Learn
Note: To create a support ticket, you must have Microsoft 365 admin privileges, and if you're not an admin for your Office 365 organization, contact the admin for creating a new ticket. Reference: How do I find my Microsoft 365 administrator? - Microsoft Support
Please correct me if I made any misunderstanding or if there have anything else I can do for you.
Your patience is highly appreciated. Hope you a nice day and stay safe!
Best Regards,
Mia