going through portal takes you to the wrong side of the portal

What I expected to happen was...:
when walking through the portal when in the nether the portal has the same x,y orientation should "come out" on the other side in the same position relative to the portal (tested for 2x3, 3x3 and other width portals)

What actually happened was...:
player comes out on the other side (left right) to the way walking in ie. if you walk in on the left you come out on the right, if you walk in on the left you come out on the right mirrored around the centre of the portal

Steps to Reproduce:
build portal in the overworld (if the portal is likely to link to other portals it may be a good idea to build a new portal in the nether as well, not sure if this affects it) making sure the portals in the nether and overworld have the same x,y orientation

walk through left/right of portal

player comes out on opposite side of the portal as walking in

this is only a minor inconvenience but I'm sure can be easily fixed