Determine 1903 or 1909 with WIM?

Thank you DamienSolodow for raising this. Yes this is currently a limitation of how we shipped 1909.

Do you directly import the images from Microsoft VLSC \ WSUS or do you edit your images before you import them into MEMCM?

For WIM images, you can currently work around this by manually updating the image name to include 1903 \ 1909 using dism and use that as a proxy for image version. 

We have a fix in some of the insider fast builds (build numbers >19600) where you can mount a 1909 WIM image and unmount - commit it and that should update the build number properly. This fix is also available via the insider ADK builds available for download here.  Please let us know if that helps resolve your issue.

We will look into how we can resolve this in the future releases \ drops. 

Thanks