As my colleague explained, such behavior is counter intuitive and confusing for the user and we were surprised by your claim that SSRS work differently. We've made a small test with their Tablix and you can see the result in the attached pdf file, which is what we have expected.
Another thing to make clear is that we are a competitor of SSRS and not a clone or addition to it, so expecting the same behavior in both products (or any other competitor product for that matter) is simply wrong.
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