Compatability -" Legacy sun/sky/camera models" not functioning

[LQ2]

In the last version of V-Ray that I was using, if I was using the perspective viewport, and had a V-Ray sky in the scene, then I could render with GI in the V-Ray frame buffer with sRGB correction enabled, and it would render as if there was a v-ray camera (at least I think I could!). I'm now using version 2.20.01, and it seems to have no effect at all any more. Has it been disabled by mistake, or have I misunderstood what it was for?

Cheers,

Bill