Delirium Despair MTX does not work with Blasphemy

Delirium Despair MTX does not work with Blasphemy.

When using Blasphemy the curse 'aura' is the default purple colour, not the grey delirium colour.

This is disappointing as all other effects including if you cast Despair on the ground and the curse debuff icon above monsters heads, both show as grey.

This appears to be an oversight when the curse is interacting with Blasphemy.