In the City of Tears, I cannot ascend the Watcher's Spire because a combat arena gate remains locked even after you defeat the enemy:

The original is supposed to be a Great Husk Sentry, and in my game was replaced by a Giant Hopper. (There was a small boofly too, for some reason - no flying enemies in the original area.) All settings are on default.
(ETA: managed to hit the lever through the gate - somehow - so was able to progressed, but the arena remained closed.)