Cannot click close alert button if overlaps with web inspector

Slightly related to https://orionfeedback.org/d/8836-dialog-box-with-large-contents-overflow-out-of-window-bounds/2

steps:
open inspector. if it's in the horizontal position, drag it all the way up to make it as tall as possible. then run the script:

alert("This is a test with a very long text. ".repeat(300));

try to click the close button, and see that it doesn't work.
Clicks are actually passed through into the web inspector.

Safari resolves this issue by resizing the web inspector so that the alert fully appears on the web page.

0.99.129.1-rc

Sequoia (15)