Ship bug sailing to Skal

[Its_a_jelly]

Description:

Starting in month 4, the ice thaws and characters can use the NPC ship to sail away from Skal.
However, my character rented a boat on the mainland (Penny Rose), and he was unable to sail *back* to Skal during month 4 (as late as day 25).
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Steps to reproduce:

Sail away from Skal during month 4.
Once on the mainland, rent a ship and try to sail back to Skal.
You'll get a message about the ice blocking the way.
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Expected result:

The rented ship should allow you to sail back to Skal starting in month 4.
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Actual result:

Character is unable to sail to Skal.
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Notes:

I guess it will open up in month 5 for rented ships, but it should be open in month 4.

[Zahlfire_old]

You can sail from Skal starting on Month 4, but you can't sail to Skal until Month 5. It has been this way forever.

[Nobs]

It is magic ice.

[WJLIII3]

I think there's an IG justification in there somewhere about Skal boat captains being better at navigating the ice.