When using a jittered projection matrix on the active camera Projectors flicker due to incorrect projection. Either the Projector is using projectionMatrix and it needs to use nonJitteredProjectionMatrix or the Projector's matrix isnt jittered and needs jitter applied when necessary.

Repro:

1) Open attached project and scene "Scene"
2) Enter play mode
3) Select PostProcessingProfile and set TAA jitter spread to 0 to nullify jitter (fixes issue)

Result: Part of the mesh affected by the projector flickers
Expected: No flicker

Reproduces on 5.5+