> Well, this wasn't necessary on <5.16.4
No; because this was a version with a lot less features. Feel free to use the older version if you believe it is superior.
> …and this is a proposal for a workaround.
My point is that is isnt a workaround, as the javascript has no way of accessing the WEB-INF/classes
> Opening the Modeler for a deployed process (nb Edit Process button) forwards to a white page with this workaround.
I would need to check that, and if it is like that, then it is bugged.