Big updates with y-webrtc are not propagating

When large update is created(~1.7MB) syncronization silently fails. It works with y-websocket provider, but doesn’t work in y-webrtc. I’ve tried to split it to small updates, and sometimes it works, but after that updates are merged and peers state become out-of-sync.
My update is populating array with ~200 objects like {"name": "Item 1", "image": "image1"}