I've submitted a bug report to Unity. Will update you on the results.

I don't know if it's possible for them to put a compile-time conditional on the camera type, so I'm not sure how they would fix it.

Perhaps ShaderForge could have a toggle for the camera type?

Thanks!

No, I just have one shader. Yes, all changes are updating correctly except the Blend Offset and Units values. I can see in the resulting shader in the Pass Body, the line for "ZWrite Off", but then there is not a line for "Offset <x>, <y>".