@Baron:
It seems this optional rule is not part of the new rulebook.
Also, it seems that Subs cannot block unescorted TPs doing an amphibious assault.
Any other changes between the 2017 release and the original?
Edit:
I don’t think submarines ever could attack unescorted transports on the opponents turn. I’m pretty sure the “on station” rule was introduced in Pacific 1940.
As for the escorts, that originally appeared in the FAQ. If WotC bothers to repost that document the optional rules will no doubt be included too.
2nd Edit:
Apparently the new rules include the FAQ and errata. So maybe the escorts are being left out on purpose?
https://www.axisandallies.org/p/return-axis-allies-anniversary-edition/
Rules now include errata and FAQ (Avalon Hill/Wizards worked closely with Larry Harris on this)