V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE not working with AV1 encoder

We run the command on Jetpack 5.1.3 and can see forceIDR take effect:

01_video_encode$ ./video_encode a.yuv 1920 1080 AV1 a.av1 --report-metadata -idri 60 -rpc "f33,i1#f121,i1"

Could you help give it a try on 5.1.1? We would need some time to set up a 5.1.1 device and it would be great if you can help try it.