Opening Safari with URL via terminal also opens URL in default browser (Chrome)

When using the command open in the terminal, there seems to be this weird issue/behavior where if run to open a specific application (in this case Safari) where my current default browser is Chrome, the following command would open up in both Safari and my default browser.

open -a /Application/Safari.app/ https://www.google.com

Opening up a different browser, such as Firefox does not have this issue. In that case, only the specified application does run as expected.

open -a /Application/Firefox.app/ https://www.google.com

open -a Firefox https://www.google.com

Is this a bug or a desired effect?

(Tested macOS 11.4)

I have the same issue in Ventura 13.1 on my Mac Studio. Seems like a bug to me.

I'm observing the described behavior on my Mac M1 (13.5.1) as well.

Surely this cannot be intentional.