I am just curious why hull upgrade fix got dozens of tables to agriculture?

Is the mod enabled in the launcher?

In any case, even though it should had worked fine, I recommend using my ultimate fixes mod instead https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1999136521 which also includes the hull bonus fix.

And yes it works in the Last Roman too.

Nope. Nothing. Also does this work on DLC's? Because I tried it on Last Roman.

are you using any other mods?

Do we have to start a new game? Or do I have to destroy and rebuild the building. Because I can't get bonuses even tho it is in a port city.

lol, I agree, but I believe they may have done it that way to avoid the hull strength be applied to ships in sea regions adjacent to provinces/regions with the carpenter building but without a port

Base game logic:
Exterminating a territory so completely that an area the size of some modern countries get effectively nuked in a single season: Realistic AF
Taking some logs you got from where they grow to a port just down the road: WTF no don't be silly