Let me starts with an example:
US 7598276 B2 was filed on Nov 7, 2006 having 1 day of PTA.
US 8557852 B2 was filed on Aug 28, 2009 which is division of '276 with 546 days of PTA.
There is no terminal disclaimer filed:
what should be the expiry.
Nov 7, 2026
Nov 7, 2026 + 546 days of PTA?
This is certainly different from : Parent patent expired due to non-payment - are issued continuations still valid?