I tested the described scenario on my end in the CustomFilterControl SDK example, however I was not able to reproduce the observed behavior. That is why I am attaching the sample project, which I used.
Can you check it out and see how it differs from the setup on your end? Should you need any further assistance, may I ask you to elaborate on what I need to alter in order to replicate the same result in the attached project? This way I will be able to investigate the scenario and better assist you.
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