Running into the same thing. Am no longer able to place breakpoints in any project:
Couldn't find the Objective-C runtime library in loaded images.
Message from debugger: The LLDB RPC server has crashed. You may need to manually terminate your process. The crash log is located in ~/Library/Logs/DiagnosticReports and has a prefix 'lldb-rpc-server'. Please file a bug and attach the most recent crash log.
Topic:
Developer Tools & Services
SubTopic:
Xcode
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