Hello @Simon,
I’ve read your description carefully, and there’s something I’d like to know. You said:
Did you use the File > Duplicate option to make that copy? If you didn’t, that could explain the issue. That option will grant the new Library a different internal ID. Therefore, it should detect it as a different document and allow the Replace tool to flag it as available.
Could you try this way and let me know if that works? If it doesn’t, I would like to test this myself if you don’t mind. It’s not the same case as this recent one, but the same response applies, since I will need:
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A copy of the old Library (dark).
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A copy of the new Library (light).
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A copy of the document where you want to replace the Library.
Could you send the documents to productsupport@sketch.com so I can take a look?