When you place a conveyor down they act as if they face away from you IE: Place facing south conveyor moves south.
Currently in every direction but north it rotates them in an incorrect direction.
East -> West
South -> East
West -> North

3.0.2 is uploading as we speak :D.

Are you saying conveyors face towards you instead of the direction you are looking? If so, it may be because you are sneaking while placing the conveyor.

Your first example is totally valid and should be what happens. If the player faces South the conveyor should move entities South assuming you aren't sneaking.

I'm not experiencing absolutely any undesired placement behavior, and that's with my quite extensive testing of the new update.

Holy wow... I totally forgot part of the bug report -.- Thanks Brain...

I'm on a server and the only direction that the conveyor faces the direction you face is North. If you face east it places the conveyor it faces east for a split second then switches west. I knew about shift clicking but forgot to test that also.

After a quick test it seems to be a server only issue as in SSP there is no split second rotate.

It's fine was just confused for a second. I can confirm it's happening on servers in 1.10.2, fixing to check 1.11.2.

I have a feeling it's a 1.10.2 specific bug.

Yup, it's purely 1.10.2. Looking into a fix.

Edit: Fix was really simple. I was using getStateForPlacement in 1.10.2 instead of onBlockPlaced.