Custom security trimming (Post) doesn't work in Sharepoint 2016

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Custom security trimming (Post) doesn't work in Sharepoint 2016

I write a customer trimmer according to
https://msdn.microsoft.com/en-us/library/ee819923.aspx
It works in SharePoint 2013.
I set up SharePoint 2016 develope enviroment and did the steps one by one.
However, I encountered a problem that each member of documentCrawlUrls
is null. The count of documentCrawlUrls is correct, and the trimming result is also correct if I set the return values(BitArray).
public BitArray CheckAccess(IList<string> documentCrawlUrls, IList<string> documentAcls, IDictionary<string, object> sessionProperties, IIdentity passedUserIdentity)
{
}
So, this problem only happens in SharePoint 2016. It is correct in SharePoint 2013.

brouno