Anti-aliasing doesn't work with deferred rendering

Steps to Reproduce:

1. Import any resource pack with PBR capabilities;
2. Enable the experimental toggle for Render Dragon features;
3. Switch rendering mode to "Deferred Technical Preview";
4. Slide between the different anti-aliasing levels in the settings.

Observed Results:
The anti-aliasing setting changes nothing.

Expected Results:
The anti-aliasing smooths the edges of blocks.

Notes: