Greetings,
I like to explore, but I think it's not a good idea... because of that, one of my quest objective is failed now.

[Spoiler]
The Beast of White Orchard

In fact, I found the Griffon's nest, and the plant before I should to talk to the military guy.
So I wasn't able to do the side quest after that: talking to the hunter Mislav, and Tomira the herborist. Thereby the quest objective "Examine the site of the Nilfgaardian soldiers' death" (but I have investigated the place...) was marked as having failed (but not for finding buckthorn).


Regards.

The same thing happened to me. Frustrating, because apparently Mislav has a quest that players who explore are now locked out of. Tomira's quest is attainable at least, but it is a shame to miss out on the quest, especially with xp being so sparse on death march.

I had this happen too, but one of the checkpoint saves was only a few minutes earlier, so I loaded that because I wanted to do all parts of the quest. You can get some interesting back-story on Mislav, which sheds a little further light to various dialogue conversations, and extra information about what happened in Devil by the Well.

Apparently a lot of people have also had quests stuck in the journal because they found treasure that was part of a quest, before they had the quest. Hopefully these kinds of issues make it into a patch, because it does make one a bit timid toward exploration.

Oh seriously a quest from Mislav? :(

I've got an other example of "broken" story, with the quest of "Missing in Action":

[Spoiler]

I found the brother BEFORE talking to Dune. So when I met Dune, I've got no choices about the other soldier... I just found his dead body when I reach the house.

I really feel that the game does not allow exploration ...at the risk of missing important elements, quests!

yeah this borked for me also. I was kind of annoyed, I found out an hour after and couldnt do anything about it.