New trade bug from last patch

I didn't encounter this bug until the last patch so I swear it was introduced then. It seems that trade routes are now being mistakenly identified as over land instead of over sea. I saw the bug starting a new GB campaign and reproduced it starting an Ottoman one. If you start a nation that doesn't have all its sea ports used up, you can create a ton of new ones since they'll be mistakenly identified as a land trade route instead of a sea one.

I haven’t found this to be the case with the factions I was playing.

Is it perhaps faction specific?

There are overland routes but you know you can still be next to a small faction and not be allowed to trade with them.

I never seem to be able to trade with most of the small landlocked factions even if I share a border.