I'm not 100% sure I experienced this exact issue but I can vouch that nether portal behavior is not as expected in 1.4.2 my example:
I created over-world portal X which created a nether portal NX.
later I built platform and "temple" near X and built a new portal Y (~ 30 blocks away) Y properly took me to NX however when entering NX It created a new over-world portal Z ~100 blocks to the west. completely unexpected. I tore down the new portal but every time I entered NX it would take me to the Z position.
so In the nether I tore down NX traveled far away to another portal we had that linked to a distant over-world portal (~300 blocks away in the nether). then went all the way back in the over-world and entered Y (to force it to create a new nether portal) new portal NY was positioned over top of NX and now links propely with Y . It's definitely seems like a bug that NX could not find and link into Y and created a portal so far away.
Doug A
I'm not 100% sure I experienced this exact issue but I can vouch that nether portal behavior is not as expected in 1.4.2 my example:
I created over-world portal X which created a nether portal NX.
later I built platform and "temple" near X and built a new portal Y (~ 30 blocks away) Y properly took me to NX however when entering NX It created a new over-world portal Z ~100 blocks to the west. completely unexpected. I tore down the new portal but every time I entered NX it would take me to the Z position.
so In the nether I tore down NX traveled far away to another portal we had that linked to a distant over-world portal (~300 blocks away in the nether). then went all the way back in the over-world and entered Y (to force it to create a new nether portal) new portal NY was positioned over top of NX and now links propely with Y . It's definitely seems like a bug that NX could not find and link into Y and created a portal so far away.