swift repl fails under swiftly

[heckj]

I have swiftly (1.0.1) installed, and tried to invoke swift repl. It immediately fails with a dyld error trying to locate the LLDB framework:

dyld[11468]: Library not loaded: @rpath/Python3.framework/Versions/3.9/Python3
  Referenced from: <9E37CB76-6346-3B15-9356-DEA26D289DD8> /Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/System/Library/PrivateFrameworks/LLDB.framework/Versions/A/LLDB

The extended error shows all the various places it hoped and tried to find it:

  Reason: tried: '/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/usr/lib/swift/Python3.framework/Versions/3.9/Python3' (no such file, not in dyld cache), '/System/Volumes/Preboot/Cryptexes/OS/usr/lib/swift/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/System/Library/PrivateFrameworks/LLDB.framework/Versions/A/../../../../../../../../Library/Frameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/System/Library/PrivateFrameworks/LLDB.framework/Versions/A/../../../../../Developer/Library/Frameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/System/Library/PrivateFrameworks/LLDB.framework/Versions/A/../../../../Developer/Library/Frameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/System/Library/PrivateFrameworks/LLDB.framework/Versions/A/../../../../Frameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/System/Library/PrivateFrameworks/LLDB.framework/Versions/A/../../../Python3.framework/Versions/3.9/Python3' (no such file), '/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/System/Library/PrivateFrameworks/LLDB.framework/Versions/A/../../../../../../usr/lib/swift/host/compiler/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/usr/bin/../../../SharedFrameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/usr/bin/../../System/Library/PrivateFrameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/usr/bin/../../Library/PrivateFrameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/usr/bin/../../../SharedFrameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/usr/bin/../../System/Library/PrivateFrameworks/Python3.framework/Versions/3.9/Python3' (no such file), '/Users/joeheck/Library/Developer/Toolchains/swift-6.1-RELEASE.xctoolchain/usr/bin/../../Library/PrivateFrameworks/Python3.framework/Versions/3.9/Python3' (no such file)

I don't have /Application/Xcode.app at all - having renamed my Xcodes by version to have multiple of them more easily.

If I disable swiftly, the built-in toolchain correctly finds and links the libraries and swift repl launches as expected.