I'm running into an issue where SSAO

[undone garden]

Here is a teapot renderer in the depth prepass

Here is the same teapot when rendered as part of the main flow (like during DrawOpaques). Note that parts of the teapots top are discarded due to alpha clipping on a custom shader.

I guess I don't really even understand why SSAO has to do a depth prepass at all, it seems to render after DrawOpaque, can't it just the depth buffer from that?