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As with other errors, I think this error need not be raised if the merge action does not refer to the merge-source in any way, because that means that only one source needs to be read. Correct me if I'm wrong about this, but the merge action was just a constant, and I think that _might_ mean that the error is not thrown. I propose to fix this by explicitly referring the source by using current-merge-group.
Fixed as proposed.
Was resolved > 30 days ago, closing.