Broken Nether Portal

Hey, so i was recently playing Minecraft: Bedrock Edition, and noticed there was a bug with the Nether Portal, so when I go in the nether portal, it's perfectly fine, but when i want to go back, then I get suffocated in bedrock, and also the world I was playing was made before 1.17 came out, and i spawned in y66 but in the new update I spawned in y128, and when I go back to the overworld in the nether, I get suffocated in bedrock at y66, please fix this bug as it's irritating. (By the Way I got myself out by quitting the world and joining again)