Hello gm86
The approach suggested as a workaround in the thread you have shared, suggest to create smaller subsection on the inside face of the thin body. However you seem to have divided the entire thin body while attempting to mimic the approach.
I tried with a single body and only the face divided but not the entire body. The results looked much better with these changes. Please try the same and do let me know if you still encounter any strange observation.
Regards,
Gaurav
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