It's a known bug that Google seems unwilling to address. This happens on a months old Chromecast v3 by Google. Unfortunately they disabled the (standalone) logi

It's a known bug that Google seems unwilling to address. This happens on a months old Chromecast v3 by Google. Unfortunately they disabled the (standalone) login feature on the Chromecast so you cannot prevent this by logging in. Ads show on the next video when autoplay is on. Unless you play from a playlist. All in all quite annoying.