Yesterday while playing, I went over to BURG.L to get some quests and get the Torch+ from him, I was chased by the Wolf Spider into the entrance. Now this wouldn't be an issue except for the fact the Wolf Spider actually managed to clip through the door thus allowing him into the lab where he chased me all the way down to BURG.L. I'm fairly certain that the Wolf Spider shouldn't be able to do that.
The way you can reproduce this is by getting a Wolf Spider to pounce on you at the Great Oak entrance to the lab.