I had the same problem. Removing the shell script makes the project compile again, but the built AAX cannot be loaded, PT development version 12.4 says it’s no valid aax plugin.
I tried both, copying the PluginName.aaxplugin to the PlugIns folder next to the development executable and disabling the local PlugIns folder by renaming and using the global folder, where Xcode placed the plugin. Same result.
It is now placed into the global folder (which makes not much sense, as it needs to be wrapped before it can be used by production versions of ProTools anyway). If I can configure that one to point to the location as it was before would be nice…
Checked the VST3 build with the juce plugin host to be sure, that one works…
Any ideas?