I installed Opera and used the whatsapp icon in sidebar and paired with phone. Moments later windows defender gives me an alert about this item.
containerfile: C:\Users[username]\AppData\Local\Opera Software\Opera Stable\Cache\f_000f8c
file: C:\Users[username]\AppData\Local\Opera Software\Opera Stable\Cache\f_000f8c->(GZip)
I remove it and when I open opera again it comes back.
I hope it's a false detection because I like some opera features like the popout video player but it's really not a good first impression.