Wrong normals in UE4 Sun Temple with Falcor 3.2.1

When using the Sun Temple scene in my Falcor 3.2.1 project, the normals are not correct:

This surprised me, as the ORCA scenes are specifically designed to work with Falcor. I tried to invert several channels of the normal map but could not achieve a correct result. Does anyone have any idea on what’s causing this?

I tried the sun temple scene in a completely fresh project (using the simple deferred sample in 3.2.1) and the normals also were incorrect.
I appreciate any help.
Thanks in advance and greetings