https://en.wikipedia.org/wiki/Split-brain_(computing)

The more you know!

>a Proxmox cluster with two nodes is fucked and why we recommend an additional "witness".

Reminds me of the three Magi from Evangelion: https://magi.kinta.ma/

"a man with two watches can never be sure as to the time"

need a third one to confirm which of the 2 is accurate