VFB not saving entire image when doing region renders

Say I render something in progressive mode, and save to a .vrimg.
Later on, I load that .vrimg, and re-render a small section

When I save to exr with the ‘save all images to a single file’ button, it now only saves the updated area.
I’m sure in V-ray 3.6 it used to save the entire contents of the VFB (most recently rendered region, as well as everything else)

How do I get this behaviour back?
As sometimes I’d like to render a couple of regions and have them all save to one file along with the rest of the render

This is the current expected behavior. Disabling the region prior to saving from the VFB will output a full-frame image. You can read more in the technical documentation regarding region rendering here: Chaos Docs

Ah! Thanks, that’s actually a handy feature