Mage Bolts on Slopes!?

[Baler]

So they recently "fixed" mage bolts. But I've been experiencing a issue.

If you are standing on a slope with a mob slightly down the same slope from you.
Cast a bolt spell at said mob, the bolt travels through the air, curves down to the mob &
no damage is done, not even a message.

I believe this is due to how they're handling line of sight with the "fix"

However!

If you are standing on a slope with a mob slightly up the same slope from you.
Cast a bolt spell at said mob, the bolt travels up the slope to the mob & damage is done!

Is this classic or should I be putting in a bug report?