ios 11.x MPSCNNConvolution results all 0

Hi I have a App using CNN. The App works well with iOS 10. When I ran it with iOS 11, however, I found the resulted images were all 0. I debuged the program and found one MPSCNNConvolution gave all 0 as output. Does anyone know why or have similar experience?

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Anyone knows this?

same question

does this happen in newer device with a11 processor only? Does it work well with version 11.2 and have problem with 11.3 and 11.4 only?

I have filed a bug request of Metal Performance Shaders which has issue with A11 devices since ios version 11.3. The developer told me that the issue will be fixed in ios 12 which expected to be release around Sept time.