Resolve 20 Nvidia Hardware decoding issue Sony XAVC codec

I have an Nvidia RTX5080 with latest driver, and using Resolve Studio 20 beta 4. Most H.264 and H.265 422 files can be decoded using my GPU NVENC, which is really fast and smooth. However, I noticed that the file from my Sony FX6 which is .mxf file shot in XAVC I codec was still decoded with CPU only. But the XAVC codec is a variant of H.264, so it should be able to decode by the GPU, I also tried files from FX3 which is the same codec, but in .mp4 container, and it does decode with the GPU.