Cant rename Boolean node to DiffuseTexture

In Fusion 8, I can rename a Boolean Node to just about anything
DTexture
skhdfvkdjhkjdh
etc
But for some reason I can't rename it to DiffuseTexture. Is that now a reserved internal name or why can't I rename it to that?
DTexture
skhdfvkdjhkjdh
etc
But for some reason I can't rename it to DiffuseTexture. Is that now a reserved internal name or why can't I rename it to that?