Constraints gets evaluated once before executing actions so a previous action won’t affect next action’s constraint. That won’t change.
There is no need to create a constraint for execute script as you can pass constraint parameters to script and make that constraint check inside script.
On next update you’ll be able to execute automation commands inside script. As we have a method to read / set local settings inside script there won’t be a need for constraint for execute automation command action too.
I hope that will help a bit.