Why does pasting into proxmox shell, sometimes work, sometimes doesn't ?

Hello,

In this case by console I really mean the node's shell
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I searched and I could not find a console/tty/shell setting there, like there is for VMs and LXC containers
 
You should be able to see the same settings both for the node's shell and for the VM / container console, so it shouldn't matter whether it's a VM or the host itself. There's a small button on the right side of the Shell button where you could start xterm.js. You should be able to paste into the console afterwards.

Shell xterm.js.png