Well, that's debatable. The WHO made a statement that asymptomatic spread was rare but then immediately walked it back[0], quite awkwardly I might add if you watch the spokesperson's press video, most likely due to US political pressure[1]. There are studies from as far back as February from Germany, that challenged previous asymptomatic spread studies[2], and another one in May[3], although that one comes out of China and may just be trying to cover their response.
[0]: https://www.webmd.com/lung/news/20200609/who-clairifies-comm...
[1]: https://www.cnbc.com/2020/06/10/dr-anthony-fauci-says-whos-r...
[2]: https://www.sciencemag.org/news/2020/02/paper-non-symptomati...
[3]: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7219423/