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The fade-out feature of the Headless UI modal may not function properly when a button is present in its content because the button click event may be intercepting and preventing the modal from closing. This can happen if the button has a click event handler that is not properly configured to close the modal or if the button is not properly detached from the modal's DOM when it is clicked.

To resolve this issue, the button should be properly configured to close the modal when clicked or it should be detached from the modal's DOM so that it does not interfere with the closing mechanism. Alternatively, the fade-out animation can be triggered programmatically using the modal's API instead of relying on the built-in closing mechanism.