Obsidian Duping Glitch

You can get infinite Obsidian easily, however it takes time to get amount u want, depending on the amount, if you make a nether portal with no edges (10 blocks as anyone would do at start) the nether generates the portal with 14 blocks, filling the corners which if you mine that nether portal, you get 4 additional obsidian, and if you form another 10 block portal in the nether really close to the base portal, you can also get the obsidian from the 10 blocks portal that you built at spawn, which adds 10 more blocks = 24! along with the new portal = 14 = 24 + 14 = 38 obsidian, please mojang fix this bug and let the generated portal spawn without edges if i built it without edges, but not the same blocks that fill the edges too! except more obsidian because that would be another type of duping, mojang please fix it,