Using seed behavior "fixed" seems to disable transforms

[andyd-glintpay]

Hi
I'm running a 3D animation in Deforum in Automatic1111. If I set the seed behaviour to "fixed", then I lose all translation keyframes. E.g if I set translation_z to something simple like 0:(1), then the resulting render does no zooming at all. If switch seed behaviour to "iter" then transformations work again.
Anyone else seen this?

Andy