Yes, Google does this, and it is infurriating.

Every time I open the dev tools on Safari (to reverse-engineer some random broken website that doesn't let me do what I need to and forces me to write yet another Python script using Beautifulsoup4), Google logs me out of all of my accounts.

To add insult to injury, Google's auth management is so broken that if I log in to the "wrong" account first by accident (E.G. when joining a work meeting from Calendar.app), that account now becomes primary for Google Search / Youtube, and there's no way to change that without logging back out from all accounts and then logging into them again.