This is actually 2 bugs

Bug 1: If you have equipment that extends sight (such as a telescope) then quest locations can spawn in inaccessable positions behind the gates. This happened to me with the 2nd gate in the pit of lost voices - the quest location spawned next to the dragonlord and behind the locked gate

Bug 2: The blurb states that all your troops run away in the final battle, except they didnt - they stuck around and helped me fight the dragonlord - this seems to be a new bug as this worked fine in the past