EPS fallback happening smooth but UE don't come back to NR

Yes, Idle mode Mobility control information (IMMCI) from RRC connection release may force your UE to stay on an EARFCN that has no definition to NR in SIB24.

Here is an example of RRC release with IMMCI:

In this case UE will go to earfcn 2950 and will stay there for 3 hours unless a new RRC connection request will happen.