Key signatures applying differently based on selection.
S3 - Major
Have a multi-system instrument.
Select a rest/note.
Click desired key signature.
Et voila! You now have two different key signatures in one instrument.
Honestly just very confusing and undoubtedly not the intended action. Some of the behaviour when selecting specific elements vs. whole measures seem unnecessarily confusing and counter intuitive.
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Yup, that is a local key signature.
Select a measure instead and then apply the key sig. That's at least a workaround, if not even the fix