Search Youtube API don't work for some channel

I'm trying to use the youtube search api and I have a weird behaviour.

If I'm using this url (you can't use without an api key) :

https://www.googleapis.com/youtube/v3/search?part=snippet&q=UCVG8kYUf9q53DNHJqq_daew&type=channel&maxResults=5

I don't have any result, even if the channel UCVG8kYUf9q53DNHJqq_daew do exist.

I can try with other channel, like this one : UCzbuINvbG-NCDVtQkfz_lcQ and it works

So I don't get it. Is there some subtleties on this API ?