Does the iOS 11.3 update break ARKit SCNMaterial rendering on face node?

Running a fresh build of the exact same application on iOS 11.2 and 11.3, everything works fine on 11.2, but on 11.3 it appears as if none of the materials are getting rendered onto the ARKit face node, that uses a SCNMorpher and blendshape values to update.

I'm going to dig into this more and report back a fix if I can find one, but I thought I'd drop a beacon here to see if anyone else is having similar issues, and if so, if they've found any solutions, or if anyone has any ideas in general.


It is my understanding that minor version bumps should be fully backwards compatible. Is that correct?


Thanks


https://imgur.com/ikYN9R1


https://imgur.com/4qWRMIu