I found a curious bug: when having a Bluetooth headset connected, playback of local downloaded Dolby Vision videos only play with sound. If i disable the BT headset, playback works fine.
If I do the same test with distant files from a NAS, playback works fine with or without the BT headset.
Edit: this is specific to DV videos, HDR and H264 works fine.
Edit2: Scrolling shows thumbnails correctly
Infuse Pro v8.0.5 (5028)
Sony WH-1000XM5 headset