@TeamYouTube @YTCreators Custom Thumbnails are no longer sticking on my channel. They'll show almost everywhere my end (Studio Beta/Classic) and via links. Sometimes it shows a random thumbnail during edit (not an auto-generated one). Happens since Premieres enabled.
I did send feedback thanks. This might help your team. Chrome uses this (what I see) https://i.ytimg.com/vi/ul0YGkZDEr8/hqdefault.jpg?sqp=-oaymwEZCPYBEIoBSFXyq4qpAwsIARUAAIhCGAFwAQ==&rs=AOn4CLAQ-7PsSxTnzLmQv9JVjfDkf26Jdw … Firefox uses this (Correct one) https://i.ytimg.com/vi/ul0YGkZDEr8/hqdefault.jpg?sqp=-oaymwEjCPYBEIoBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLDbkGFnqo07dS5cdZRx5RXFTEDOkw … Happens with new video too.