Are your wall studs by any chance flush with the outside of your wall surface = occupying the same space?
Even if not, why is that layer turned on? If you model studs, they should only appear in a framing view. Just turn off that stuff and your render should be fine...
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB