Xcode projects all no longer Clean

I compile plugins for Adobe Illustrator using CORE and Adobe SDK libraries. Xcode 14 has recently refused to clean any of my Xcode projects, system wide, although they compile and run fine. If I change Project Settings > Advanced > Build Location from Legacy to Default, it cleans fine, but when debugging, many breakpoints cannot be used. The marker has a dotted outline and a popup states that the breakpoint cannot be resolved.

I'd like to stay with Legacy for the Build Location, and resolve the cleaning problem. Changing permissions or deleting contents of build folders hasn't helped. Has anyone else seen and solved this issue?

macOS Sonoma 14.6.1 Xcode 14.3

Xcode projects all no longer Clean
 
 
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