Board Thread:Questions and Answers/@comment-25648422-20180501131544/@comment-9136029-20180501184143

Same here, so you're not an isolated case. And apparently the code is still correct. I don't know if the problem comes from Niconico itself...

Little thing I note, is that when there are both a NND video and a YouTube video for the same case in a template, the preview of YouTube is the one showing up. Just take a look here for example.

And this is happening since... Few days ago already? I don't remember when it started actually, but it's been a little while this kind of "error" is showing up.