The end portal did not spawn

Hello mojang i am typing to tell you that i started a survival world right before the latest update. When i finally got the eyes of ender me and my brother set off to find the end portal, when we got there we found only two of the rooms that spawn there. We mined basically the whole fortress and did not find the portal. Since i found it so strange i copied the world went into creative and blew the place up only to find that there was no end portal. Ps. I think that the new update somehow covered the portal. Thankyou for your time