Can Endermen spawn on smooth stone?

I have been 30 block away on my farm in Minecraft Bedrock because my simulation distance is in 4, I did that because the tutorial said so, but he said I can use any solid block for Enderman to spawn, so I used smooth stone (because it looked kinds cool) and they don't spawn in, I tried replacing it with the end block, and worked.

Is this a bug?

An Enderman can spawn on any solid surface that has at least three empty spaces above at light level 7 or less. They are the only mob that spawns in all 3 dimensions.

Just like all other mobs, Endermen need to spawn on a solid, opaque block. You can pave an area with half-slabs, stairs, or glass, among other things, to prevent them from spawning there.

Here is a list of spawnproof blocks, and Smooth Stone is not listed.