After playing a few games, it's quite clear that the RIOT Devs have completely messed with Omen TP's without explicitly letting the player base know about it.

PROBLEM: Omen TP's no longer work around tight corners.

HOW: Omen TP's apparently have to be aimed at a set distance away from any wall or object to be able to TP. ****WAY FURTHER than previously.

So what does this mean?

Omen players will now have to peek out wider to avoid a wall OR object than before to get a TP off and is no longer able to TP away from danger in tight areas.

EXAMPLE: Say you're on top of box in b main on Icebox. Omen players can no longer teleport away from a rush. So if you see an Omen on the top most box in B main... he's stuck there and can't TP to safety and run to b site without getting caught from a rush.