This appears to be a repeating issue: users clicking create instead of selecting the one already present, when both are the same.
Please add setting for unique values for many to many fields like Tags.
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If your Tags are in a database, then you can simply require the Name field to be unique:
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Alternatively, use access control to limit who is able to create new entities
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Thank you, that worked. Good enough for now (albeit a bit clumsy ux)