The entire "Whiteboard" application becomes unresponsive when any portlet configuration modal is opened

REPRODUCIBILITY LEVEL:
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Always

STEPS:
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1. Log into Liferay as an Admin user.
2. Navigate to the Whiteboard page.
3. Open any Whiteboard configuration modal (example: Look and feel configuration).

CURRENT RESULT:
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The application becomes unresponsive.

EXPECTED RESULT:
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The application should display the configuration modals correctly.