M3 AV1 hardware decoding requirements (encoding options, pixel format etc.)

Are there any restrictions on the encoder options, pixel formats, etc. that can be decoded by the M3 AV1 hardware decoder? For H264 and H265, only a subset of the bitstream options are accepted, both for hardware accelerated playback and any use within TV.app or QuickTime. I can't find either an official list on Apple's website or a list of successful settings in ffmpeg's wiki.