Airbus writes:

In the case you cite, where one ceiling is lower than an overlying floor, the
space between is also readable on the chart - usually Class E, which is not
uncontrolled airspace.

The space between is not specially marked on the chart. It must be inferred
from the vertical limits of the surrounding airspaces.

Pilots know how to read the charts.

Most of them do, in most cases. So do I.

Fortunate we are that you do not fly airplanes, and we do not have
to worry about sharing the airspace with you and your fuzzy theories.

I find it increasingly plausible that many PPLs do not look things up and are
undisturbed by their ignorance, but I nevertheless hope that this is not too
widespread.