I think it's major since you can scout over the baron wall or even steal baron with it.
As i tested,it only works on the baron wall.
1.Play Elise
2.Use your Volatile Spiderling on the spot located on the screenshot.
3.Stand as much as possible near the wall.
3.Enjoy watching your spiderling pass through the wall.

Attached Images

Screen02.jpg (19.9 KB, 100 views)

Nice find. Keep up the good work. <3

~Summoner namora, of the lower case.

Just a tip: The screenshot is small. Change the file extension of the screenshot to .jpg, because the forum is configured to resize images of extension .png to 620x280.

Sorry for the delay, but I can confirm this bug. I kept forgetting to go test it.

The "right spot" is just to the right of the rocks inside of the Baron pit.

I'll add this to our internal list of bugs.

Edit: I've determined that this can occur at other thin walls if fired at a similar angle.

This happens with malzahar aswell.
sometimes his minions get stuck in the wall and provide visions both ways, a bit like putting orianna's ball in the terrain.