Joining of all india round 2 is till 19 feb

Joining of all india round 2 is till 19 feb , while state round 2 result will be announced on 15 feb
Isn’t it possible this time that students who hold a state round 1 seat will be able to decide which seat to opt i.e. all india round 2 or state round 2 seat
And if those students take all india round 2 seat will it not lead to many state round 1 seats not coming in state round 2 counselling and eventually those state round 1 seats go in mop up
I suppose this will be prevented only if there is a deadline for state round 1 seat resignation
So is there any state round 1 seat resignation deadline for joining all india round 2 seat ?
I am confused

I don’t think it’s that simple .as far as Bihar private college s is concerned they have told you either resign r1 seat before Bihar r2 s and opt for all India r2 or take the given r1 seat of Bihar