Request UnPublication not working
I used the Overlay Node [/libs/wcm/core/content/sites/publishpagewizard/jcr:content/body/items/form/items/wizard/items/publishstep/items/fixedColumns/items/fixedColumn1/items/references] to bind the "Request Publication" action in the page information tag to a custom Workflow. However, the "Request UnPublication" action doesn't work. Even without the Overlay Node, clicking this button doesn't trigger any action or show any errors.
The following image shows the button properties I inspected using the development tools (without Overlay Node for UnPublication). It seems that some attributes are missing compared to the Publication button.

Additionally, I'm using AEM Forms version 6.5.12.0, and the Forms package is adobe-aemfd-win-pkg-6.0.640.