Placement Pending changes are not clearing for bing

Bing wont support display network(Content Type) feature to add the placements to adcenter but it adding placements in pending change table and adds to bce_placement and bce_placementPendingChange table with searchEngineIdentifier as NULL.

In production database following is the count.

mysql> select count from bce_placement;
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count

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1 row in set (0.02 sec)

mysql> select count from bce_placementPendingChange;
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count

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1 row in set (0.02 sec)