Editor bug? New Editor Window resolution increases every time you click play

This is pretty easy to replicate, just select New Editor Window for Play Mode, and open the Editor preferences, check game viewport settings as below:

every time you click play, width will increase by 2 pixels, and height by 8 pixels.

if you check “always center first viewport window to screen” it will stop happening, but then the window will only open on your primary screen, and I prefer it on my secondary screen.

this is very annoying. is it a known bug?