Created a portal in the Overworld which formed in the Nether(as two portal frames intersecting at the corner of the obsidian frame), but going through the portal for the first time in survival lodged me in solid stone and suffocated me. Going through the second time in creative brought me to the portal that was created in the nether without incident. I later created a portal in the Nether(as pictured) which created the portal shown in the Overworld photo also included, but going through it emerged me into solid stone far below it, as shown in the picture. I dug out the stone in creative and climbed out. As you can see from the image, the Overworld connecting portal was never activated when it was generated from the Nether.