Processor never goes in deeper C states when Pipewire is running

I noticed that as soon as PipeWire is running (usually after launching a flatpak app), my computer (X1 Carbon 6th generation, i7-8550U) no longer reach C-states deeper that C6 for the whole CPU package, with one of the core stalling that by never going under C8.

When PipeWire is not running all cores happily reach the C10 state.

I tried by just launching and stopping pipewire from the shell and I can consistently reproduce this behaviour.