UE-50753 to fix UE-49739. Mac Only issue slows down windows flow?

UE-50753 says “This change was necessary to fix UE-49739” … but that is a Mac Only issue, so why does Windows always have to recompile it?
I thought it was a problem with my install for a long time, but it is done on purpose? Because there was a mac crash?
How hard can it be to see if you are running mac or windows?

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks