I was building an end base and had left some glass at the edge of the seeable border and enderman began spawning in the base. The glass was not lit up but the base was and had walls. To my understanding enderman cannot spawn on glass blocks so I am not used ho this was happening I was also building over the void so no end islands were near. Once I lit up the glass they stopped spawning. I don’t know if the game is using the glass blocks as a spawn anchor and the teleporting the endermen into my base. I am very confused. If this is an intended feature I am very sorry for wasting your time. If you need any further information please do not hesitate to contact me