I have a few updates to the topic after 26.11.2020 Testlive patch (Update 2.2):
- I revisited the Sunken City, the bosses under the water level are pathfinding well now.
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Companions still have trouble showing up next to the player. The game itself tells us that companions cannot move in the Sunken City.
- As for losing interest in the player, bosses seem more focused after the patch. I tested a few cases, even if the boss couldn’t reach me and I didn’t attack him constantly, the boss wouldn’t let go (I waited 10 minutes doing nothing at all and the boss didn’t lose interest in me).