Picker does not show up

After install MacOS Big Sur, opencore boots into a black screen for about 15 seconds then booting the MacOS Installer.

Btw it showed the picker before installing Big Sur.

log: https://drive.google.com/file/d/1Xvr35AuUrx73HLB1kx3g5QgzCgxD9X7u/view?usp=sharing