Investigate need for Apple Silicon fix to Internal_Convertfwrite(...) #42954
Description
During AppleSilicon initial bring-up we observed a test failure where the Internal_Convertfwrite(...) function was being called with an empty string. This was being treated as a failure during the MultiByte to utf-8 conversion. For the conversion reporting a failure in this case was incorrect. Therefore a fix was included in #40435.
However, it is not clear why this only occurred for osx-arm64 and not osx-x64.
Temporarily remove the fix and investigate the root cause of why this only occurs on arm64. We would like to be sure the fix is not masking another underlying issue.