New sdk track only one skeleton with SampleScene in Unity

Is there some changes to skeleton tracker after later sdk’s?
Cant find any feature changes for that in sdk “new” features.
With older sdk we was able to track at least 6 skeleton same time, but with new one it’s look like SampleScene track only one.
Tested it with Unity 2019.3.6f1 and 5.6.7f1.
Any suggests or some working Unity version?