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There could be several reasons for MAUI databinding not properly functioning with CommandParameter in SwipeItem and TapGestureRecognizer resulting in a null value:

1. Incorrect Binding Context: Ensure that the binding context is set correctly for the page, parent layout, or the view where the SwipeItem and TapGestureRecognizer are used.

2. Incorrect Property Binding: Check that the binding expression for the CommandParameter property is properly set up and the binding path is correct.

3. Command Binding Issue: There might be an issue with the command binding that is being set up for the SwipeItem and TapGestureRecognizer. Check the command property and ensure that it is set up correctly.

4. Data Type Mismatch: Ensure that the data type of the property being bound matches the data type of the command parameter being passed.

5. Limited Support: MAUI is still in preview and may have limited support for some features. Check the MAUI documentation and forums to see if this is a known issue.