CK II - Ships upkeep for Tribal is too high

[Wingm3n]

One line summary of your issue
Ships upkeep for Tribal is too high

Game Version
CK2 3.0 [PXTU]

What expansions do you have installed?
Jade Dragon,
Monks & Mystics,
The Reapers Due,
Conclave,
Horse Lords,
Way of Life,
Charlemagne,
Rajas of India,
Sons of Abraham,
The Old Gods,
The Republic,
Legacy of Rome,
Sword of Islam, All of the above

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
Playing as Tribal Irish, I do not get the ships 90% reduced maintenance cost reduced

Steps to reproduce the issue.
Start any game as Tribal

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[Arkabeth]

Isn't the ship discount tied to the cultural tag of "Can raid overseas with ships"? I tested with CK2 3.0 [PXTU] recently as Norse and Norwegian culture, and they both paid 0.045 per ship instead of 0.45 per ship, whereas my randomly generated tribal guy paid 0.45 per ship.

(Off-topic, but I do however think that the "can raid overseas for loot" tag is misleading as anyone who can raid can raid overseas, only that those culture get the ship maintenance discount).