All Zorg Empire Universes run with this specific feature which ensures everything is conducted on strict priority.
The priority is kept even when missions fall on same second.

Here is the priority order for missions that fall in the same second:
1.Engaging Missions (An engaging mission is the mission that hits its target at this second)
2.a)Set returning ACS Defend missions b)Land returning ACS Defend Missions
3.Land on planet/moon any returning Missions

Note: If there are more than 1 missions of the same type then they are ordered by creation time which means that the ones that were first created, will be first served.

Any questions, feel free to ask.

So this means we can send recyclers to recycle a df you create on the same second that you attack?

It is possible to hit a target and recycle the debris on the same second.
But only if your attack fleet is slower or equal to the speed of your recyclers.