Sion Q + Lux binding bug

Hey I've experienced this bug a few times now, it seems to happen every time this particular situation arises:

Sion is channeling Q (Decimating Smash) either during or slightly before being bound by Lux's Q (Light Binding).

When Decimating Smash goes off, it will turn Sion pretty drastically. From my experience so far it rotates him roughly 45° CCW just before landing Decimating smash. Every time this has happened to me I have been facing south with Sion so perhaps this may affect the results. Any targets in the line of fire for his Q where it was originally aimed will not be hit by the Q as it lands in a different direction.

This is currently on live servers, I have yet to test it on PBE.