N13 - OMF files default to AIF on export

I have created a OMF from a Nuendo project that contains only WAV files.
Upon importing, the OMF embedded files appear as AIF.
I have tested with Sequoia, Audition and the same Nuendo where the original OMF was created and the extracted files always appear as AIF.

Am i doing something wrong, missing a checkmark somewhere, is this a bug…?