I have not played with layouts too much but I think once you change to layouts then each layout has it's own set of actions.
You can set all your actions before you change to layouts, the actions will carry across.
But some of them like Timeline actions when originally on one that is not main will come up as none.?
Seems a bit inconsistent to me. It would be better that if you do the above then the timeline should be the same.
Having it go to none seems like an oversight to me though rather than a bug.