When you set a face when PBR material to rotated 90 degrees, the actual texure image moves at 90 degrees to the texture repeat overlay. This is clearly wrong behaviour, the repeat overlay should show where each copy of the texture is on the object face, but the texture image moves independent of repeat overlay.

To recreate simply rez a cube, add a PBR texture with easily identifiable pots in it, set the face to planar and rotate the texture 90 degrees. Now use either offset to move the texture along either axis and the grid will move along the other axis.

The expected behaviour would be that the texture and the grid move together in one direction, as it does with a Blinn Phong texture.

Also, when setting a texture scale to 1:1 on a face that is 1 x 1m, the texture repeats twice in both directions on the latest official viewer, this does not happen in firestorm where you get the single stamp of the texture filling the face as is expected.