To answer my own question, the problem was because a long time ago, I had specified a custom location for my build folder for reasons I won't get into but it was necessary in old version of Xcode and its legacy build system. In addition, some of the third party frameworks I use also had custom build folder locations. Once I changed all the projects to just let Xcode handle maintaining the build folder and ensuring that my Xcode project settings was showing that it was using the Xcode Default build location and not Legacy, the rebuild problem went away.
Topic:
Developer Tools & Services
SubTopic:
Xcode
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