Orch API $orderby StartProcessNextOccurrence not working

I am not able to use field StartProcessNextOccurrence in Orch API call data/ProcessSchedules

Does not work:
odata/ProcessSchedules?%24orderby=StartProcessNextOccurrence%20asc
Works:
odata/ProcessSchedules?%24orderby=name%20asc

ODATA v4 does not have DateTime type, only DateTimeOffset. But I see that this field is a string according to Swagger.
image
What am I missing? How to sort by StartProcessNextOccurrence?