They updated the part about macOS "Important note: On macOS, the regular kill switch has two known limitations. When switching servers, there’s a brief period where your real IP address may be temporarily exposed. We’re working on fixing this. ..." https://protonvpn.com/support/what-is-kill-switch

correct, they updated their misleading documentation, you can read their reply to me for more details: https://discuss.privacyguides.net/t/video-demo-proton-kil…