In short, if Toland appears on the ceiling three times, the game softlocks and spawns no new enemies. In addition, the knights can sometimes spawn in without killing a hobgoblin, and by killing it, a third hobgoblin will spawn. Toland spawning on the ceiling has been an issue for years, even if it is "intentional". My progress through an encounter should not be decided based on how RNJesus feels that day. And yes, I am fully aware that him being on one of the four walls isn't needed to progress. Even if you do it right, there's still a chance the game will say "screw it" and give you ceiling.