So, at the part where you're supposed to get on the boat with Yennefer, it's bugged for me.
I get on the boat but the quest wont update, so I'm stuck at that part. Not to mention getting in the boat without Geralt falling in the water is a quest in itself... >_>

The quest does not update by getting on the boat. The quest updates just before getting onto the boat, and then once Geralt sits down at the prow of the boat -- he must sit down.

No. He must sit down to progress the quest. Yennefer will not move the boat until he does; she's sensibly not going anywhere while he's standing up in a boat. Not to mention the game needs him to interact with the boat to be able to tell he's actually in it, and ready to proceed. It makes sense.

Makes sense for her not to to do that then, but my confusion with all this was that the description was only "Get on the boat" making me think that's all I had to do.

Nothing big, just feel confusion could've been avoided with a better description or something but that's just me.

It did take me a few moments to figure this out myself....

I mean its a game.
It tells you to get in the boat and nothing more, and at no point in the game have you been able to interact with the front end of the boat like this until now. So why would you try to?.

so it makes sense, but not from a game point of view. Because they add a new rule without telling you.

I finish quest antd it is marked as complete but when i qo for uma and to kaer morhen then quest change his stats to failed i don't know what to do