Re-creating a world doesn't allow a blank seed and uses recreated world's seed instead of random

When you re-create a world in 1.16 or 1.16.1, set the seed box to be blank and load up the world, it will always has the same seed as the original re-created world, this only works when the seed box is set to be blank, or zero. Also this didn't happen in 1.15.2, I have been keeping up with the blog posts, I'm sorry if this was an intended feature and i have missed an update.