Viewport Cache Redraw when rotating and panning but not when using the mouse wheel?

Hello Blender developer community,

I am currently trying to fix the issues that come up with the following patch, which enables caching for offscreen rendering: rBd03b26edbdc3

Here I have created a video that shows each of the issues that come up once offscreen rendering uses the viewport caching patch:

My first question: It seems like navigating the viewport triggers a cache redraw for the workbench engine, eevee and the overlay engine, but not when using the mouse wheel to dolly in and out. Why this behaviour?

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