Trying to implement persistence using @libp2p/fetch but kubo doesn't seem to send any messages

This is my attempt custom-pubsub/demo3.js at master 路 estebanabaroa/custom-pubsub 路 GitHub

It seems to work between node.js peers, but kubo doesn鈥檛 seem to send fetch protocol messages or respond to them. maybe I implemented it wrong? or maybe kubo has it disabled? I鈥檓 on version 0.25.0