With new build (119) it now outputs 1000/0.005nits. However, I noticed something else when I was copying the HDR InfoFrame. The values sent for mastering display primaries are actually for BT.2020. It should be for DCI-P3. What does a display do with this information is something that only the engineers who designed the display can answer.
These are the captured HDR InfoFrames from Vero 4K and Amazon Fire TV 4K (the only digital media player than I know of that outputs complete & perfect HDR10 metadata that matches the source content).
Fire TV 4K, no MaxFALL /Max CLL
87:01:1a:22:02:00:c2:33:c4:86:4c:1d:b8:0b:d0:84:80:3e:13:3d:42:40:e8:03:00:00:00:00:00:00
Fire TV 4K, with custom MaxFALL/MaxCLL (277/42nits) appropriate for the Coco sample provided 87:01:1a:e2:02:00:c2:33:c4:86:4c:1d:b8:0b:d0:84:80:3e:13:3d:42:40:e8:03:00:00:15:01:2a:00
Vero 4K
87:01:1a:5d:02:00:34:21:aa:9b:96:19:fc:08:48:8a:08:39:13:3d:42:40:88:13:32:00:00:00:00:00
display primaries are in units of 0.00002, Max luminance/MaxFALL/MaxCLL are in 1cd/m2 unit, Min luminance is in 0.0001cd/m2 (1nit = 1cd/m2).