Unlink animated alpha between different materials?

In UPBGE 2.2 I keyframed the alpha channel for two materials (“Red” and “Blue”) on an object so that frame zero is invisible and frame one is visible.

As expected, this creates two actions: Red.Action and Blue.Action.

I did not expect that both actions are linked. I cannot animate one without the other following in sync.

BTW, I thought I knew how to work around this in the view port: animate four frames with each combination of on and off.

But there is apparently no way to unlink the Alpha channels for these separate materials