Query on AssignedPrivileges sequence after PATCH call

The "PATCH on array properties" clause discusses these semantics. Arrays in JSON are ordered, so yes this would matter, especially when you factor in the aspects of using null and {} to remove or leave members alone in the array.

The way to interpret your PATCH example is "Replace index 0 with ConfigureComponents, replace index 1 with ConfigureSelf, replace index 2 with ConfigureManager, etc". I would expect this order to be preserved upon completion.