Using atomic updates to remove docValues type dynamic field does not work

I have defined a dynamic field which is stored=false, indexed=false and docValues=true. Attempting to set this field's value to null via atomic update does not remove the field from the document. However, the document's version is updated. Using atomic updates to set a value for the field does work. Tested on 6.6.2 and 7.2.1. 

An example of a non-working update query:

<update>
    <add>
        <doc>
            <field name="id">372335</field>
            <field name="removed_field_262884_i_dv" update="set" null="true"/>
        </doc>
    </add>
</update>

An example of a working update query:

<update>
    <add>
        <doc>
            <field name="id">372335</field>
            <field name="removed_field_262884_i_dv" update="set">1521472499</field>
        </doc>
    </add>
</update>