PATCHing Volume.Links.DedicatedSpareDrives with null

According to the Redfish spec, Section 7.7 - PATCH on Array Properties:
"
Within a PATCH request, the service shall accept null to remove an element, and accept an empty

object {} to leave an element unchanged
"

Given the following payload for a PATCH on a Volume resource:
"
{
    "Links": {
        "DedicatedSpareDrives": [ null, {} ]
    }
}
"

We are seeing an error when trying to encode the above payload using DMTF's RDE-Dictionary (https://github.com/DMTF/RDE-Dictionary).
The error comes is seen because in the Volume's schema dictionary, DedicatedSpareDrives child is a Set whose Nullable is not set to True.
"
+-------+-------------+----------+-------------------------------------+----------------------+--------+
| 30    | 2           | Array    | Nullable=True,Permission=ReadWrite  | DedicatedSpareDrives | 1 | 65 |
+-------+-------------+----------+-------------------------------------+----------------------+--------+
...
+-------+-------------+----------+-------------------------------------+----------------------+--------+
| 65    | 0           | Set      |                                     |                      | 0 |    |
+-------+-------------+----------+-------------------------------------+----------------------+--------+
"

The question is:
Is this an issue with DMTF's RDE-Dictionary or we cannot support BejNull as a PATCHable value in Volume.Links.DedicatedSpareDrives property?

Thanks
Aditya