webenginewidgets is a recognized module, and is linked to a library in the code (libQt[X]WebEngineWidgets), but presently does nothing when marked to be deployed. This has caused problems in the deployment of my application where it is not detected as a dependency and has to be explicitly marked as such, seemingly due to the application being built with LTO. As a workaround, I had to manually copy the required library.

This is all that's logged of its "deployment":

[qt/stdout] -- Deploying module: webenginewidgets -- 
[qt/stdout]