Arrow keys do not scroll text properly in long blocks

Suppose I’m in a multi-paragraph block. If text somewhere in the middle of the block is at the top of my screen, and I use arrow keys to move the cursor up from there, I find that the text doesn’t scroll to keep up with the cursor. The cursor disappears. I have to use the mouse to scroll to find it. Only when it gets past the block does the screen update.

The same is true if the cursor is at the bottom of the screen and I use the down arrow key.

The problem is taken from this thread, where another user confirms it.

Here’s a video of it: