The shipwreck closest to the vicinity of this quest can COST you some progress if you decided to enter it's lower deck.

Once your'e down there, there's no going back up. Lol.

Ought to be patched.

I ran into that one. There are actually a lot of areas where you can get stuck with no way out besides reloading a save file. There's an area in temple isle in Novigrad where you can climb up onto the roofs and land on a balcony with a locked door and a locked window. You can't get back up onto the roof from there and the balcony is too high up to survive jumping down from. Also, if you jump off the bridge to the left when you first get into the big cavern in Fool's Gold you'll be stuck as well.

my favorite place like that is a puddle somewhere in crossing the river that separates Novigrad from nomans land.
oh yeah, not being able to get out of the puddle because someone thought it is a cool idea to disable jumps when character stands in the water waist-high...

Yeah, I got caught in that one.
And another one like it.
I just enabled fast travel from anywhere in the console.