If you are experiencing issues on your M365 environment, please make sure you are not on the Microsoft Targeted Release circle.
Microsoft releases updates to targeted release, which are sometimes not fully tested, and might have breaking changes on production.
We test our products nightly on both standard and targeted releases to be able to report issues we find on targeted release, or offer fixes before they get rolled out to standard release.
As a customer, it is not recommended to have your production environment set to targeted release.
How to check your tenant release preference