Update: I've managed to get breakpoints working in Logic X by disabling SIP and attaching the debugger to AUHostingServiceXPC_arrow.
This isn't ideal. Any ideas on why disabling SIP would allow Xcode to attach the debugger but otherwise fail?
sblinkhorn
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Bug report submitted:
FB9027211 (Xcode Debugger can't Attach to Logic Pro X (Without disabling SIP))