Noticed the issue with copy access.
User1 has Ent A & Ent B in App 1.
Ent A is requestable & Ent B is not requestable and is an entitlement map of Ent A. So, that's what they got added to the same.
User2 is requesting access to App 1 copying User1's access.
Ent A only gets added to selected entitlements but going to the next page, the list shows Ent A and Ent B is being requested & hence it goes for approval.
But Ent B, which is a dependent entitlement, waits for admin approval as there is no approver configured for them.
Issue happens in SP 3.18 & wasn't noticed in SP 3.12