Mi 8, 9.6.20
Devs, this problem once was on mi 6(https://r.tapatalk.com/shareLink?url=https://xiaomi.eu/community/threads/picture-in-picture-android-8-0-mi-6.49363/&share_tid=49363&share_fid=73822&share_type=t)
The problem with mi 6 was fixed by updating the version of Android
It's strange...