iOS can't google cast

Hello,my video could cast by google used to be, someday it can’t.
First my video has DRM, and it play fine with Bitmovin player,
and, if I cast the video by google cast, and it just stop on a black view show [CAF Receiver v3 - Stable], even I touch player play button, it won’t work.
the screen stop when i am casting by google, if I stop to cast, and it can play by bitmovinplayer again.
my develop version below
iOS sdk ver. 18.4
Bitmovin SDK ver. 3.86.0
google cast ver.4.8.3