Clicking on "Create World" in singleplayer menu freezes/lags game temporarily

I just tried to create a new world in 1.19.1-rc3 to test and confirm another bug, and when I clicked on the "Create World" button, the game froze for a few seconds saying "Preparing for world creation" (Screenshot below).

Because I could not remember the game doing that before, I tested it again on 1.18.2 and on 1.19.
On 1.18.2, this does not happen, the menu with the world generation settings is immediately there without any lag/freeze.
But on 1.19, the before mentioned freeze/lag happens for a few seconds, and then it displays the world generation menu.