i.ytimg.com/vi/oQY89chreKM/maxresdefault.jpg
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] Thumbnail download fails completely if maxresdefault.jpg is not available · Issue #21588 · ytdl-org/-dl · GitHub
All about Thumbnail Images as ytimg maxresdefault especially in Search
thumbnails extractor
How to get thumbnail images in just 1 click - HANDS ON tek
thumbnail link doesn't work in all cases - Stack Overflow