The sheet specified on the request should be applied only to the requested document

The sheet system allows you to overwrite the bound sheet with a query string parameter ?sheet=SomeSpace.OtherSheet. Unfortunately the sheet specified on the request is applied not only to the requested document but also to all the included or displayed documents inside that sheet.

I think the sheet request parameter should affect by default only the requested document. If you want to apply the sheet 'recursively' (I don't see a real use case for this) then you'll have to handle this from the sheet.