Cool! Look forward to your fix :)

sorry for typo in above link, try this: https://github.com/FinleyPan/Metal_newLibraryWithSource_Test

Because our project targets to multiple platforms, So shaders are compiled at runtime. We analyzed call stack of newLibraryWithSource, it will call TLLibraryBuilder::newLibraryWithSource which acquired resourcePath of mainBundle to serve as the working directory to compile shaders(a parameter named -working-directory). So I think there are some relationships between bundle path and shader compilation. Our workaround is swizzling resourcePath to "." when call newLibraryWithSource.

Sorry for my late reply, I have created a feedback with number FB9022420, thanks! Indeed this sounds like a bug in the Metal framework. Please create ticket with Feedback Assistant. If you post the number back here I will able to get it to the right engineers more quickly.

Temporarily fix by swizzling resourcePath. But I think it's probably a bug of Matal.framework