Question AA in planar reflections

2020.1.12
So in forward I can get MSAA on reflection probe images which make them look a lot better in a mirror for instance.

But if in deferred it only seems to apply the selected AA to the whole image last-thing, which means only FXAA really works on reflections well, interestingly... You can set a custom frame setting but the AA post process seems not to do anything
Is this a deferred limitation?

 

Need anti aliased reflections in Deferred...

 

It's not supported, see this recent answer from Unity: https://forum.unity.com/threads/pla...ring-hdrp-image-effects.1015942/#post-6590671

However, you can setup your HDRP asset to use both shader modes, forward and deferred. Then you assign for the camera deferred and for reflection probes forward with MSAA.