Bug: module_data filter on workFax return all items, even null

[bcalpha]

{module_data resource="customers" version="v3" fields="workFax" skip="0" limit="10" where="\{'workFax.phoneNumberTypeId':'4'\}" order="id" collection="myData"}

<pre>{{myData|json}}</pre>

No matter the filter for sub-objects, it always returns the null items as well.