On the page https://material.io/guidelines/patterns/navigation-drawer.html#navigation-drawer-behavior there are the following guidelines for drawer look&feel (here a snapshot with my comments/outlines):
I presume "the same elevation" requirement had a purpose not to overcrowd page with unneeded shadows which could look messy. But paradox, as I percept, occurs then. Introducing shadow (i.e. elevation) of drawer could resolve the issue though. What have I missed in my reasoning? Thanks.