Improper centralization for populated minibuffer

[daedsidog]

When the minibuffer is invoked at first, it has proper centralization for the current screen:

The minibuffer maintains this centralization no matter what. Even if I rescale my screen, it follows suit:

But when it is populated (I'm using find-file-history as an example here, but this is a problem with other commands) it isn't centralized:

The same thing applies to when the window is being rescaled. Here is an example for going from half a window, to a full window:

This issue applies to both the SDL2 and ncurses version.