Sharepoint menus not visible when OneDrive-app is disabled.

Hello,

We want to disable the OneDrive-app on personal, not managed devices with conditional access.
When we do so, a message bar appears when a user visits the online version of OneDrive or Sharepoint.

In OneDrive this message bar can be closed by clicking ont the x-icon:

On Sharepoint sites the message bar can't be closed. This is not a problem on some pages, like this:

But on the homepage of a communicationsite it covers the complete menubar and can not be closed....

That means that users can not use the site at all. Is this a bug? Is there a way to fix this?

Thanks for helping,

Paul