Filtering Keyword Performance report on display only shows 'AutomaticContent' and 'Content' keywords

We have quite some display keywords which used to show when filtering the Keyword performance report on only display campaigns, or `adNetworkType2 == CONTENT`, but when we try to fetch this now, we only see the `Content` and `AutomaticContent` keywords of display targeting optimization and the 

Google Content Network. Our own keywords are no longer returned for some reason...

Query:

SELECT+Id,Criteria,Status,CampaignName,AdGroupName,Clicks,Impressions,Cost+FROM+KEYWORDS_PERFORMANCE_REPORT+WHERE+Impressions > 0+AND+AdNetworkType1 = CONTENT+DURING+20160101,20160114

This query returns 2 keywords: `Content` and `AutomaticContent`, while in the AdWords interface (Campaigns -> Display Network -> Display Keywords) for the same date range I see at least 5 keywords with way more than 0 impressions (31,044, 34,496, etc.).

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