Probably because the saved OCEAN script uses:
and that is merely referencing an existing netlist. You'd have to use:
design("libName" "cellName" "viewName")
(and then make sure you load the OCEAN script in icfb, msfb, icms etc - not in the "ocean" executable, which doesn't have any netlisting capability in IC5141 (but does in IC61X)). If you do this it will incrementally renetlist, just as it would in ADE itself.