As previously mentioned the described behavior is an expected one and could be observed in both the old and the new themes. I attached the test project in which we tested the issue to my response, in which the behavior could be reproduced with the old Metro theme. It is possible that you have made customizations to the theme that could have lead to that behavior.
If you could reproduce the issue in a sample project and send it in a support thread it would be very helpful in determining why it was working with that unexpected behavior before updating to the latest version.
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