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    Bug 
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    Resolution: Unresolved
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    Low 
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    None
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    4.1.7
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    None
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        Severity 2 - Major
Even though Sourcetree is officially supported to work on Apple M1 Silicone there is an issue using it with SSH keys stored on external device (YubiKey). To access SSH keys on this device PKCS#11 is used.
When using PKCS#11 there is an architecture check which is failing

As you can see from the output Sourcetree is requesting x86_64 version of PKCS#11 library, but it should not, since it is running on M1 silicone.