I have several nether portals linked between the overworld and the nether.  They are no longer consistenly linked after the 1.17 update.  Additionally, portals sometimes exit the nether to the overworld at the same coordinates as they had in the nether (rather than dividing the X and Z values by 5/6/8/whatever). 

Are there new rules for the ratio between distances in the nether and the overworld in 1.17?