Managed Metadata allow mulitple values cannot be crawled

I am using SP2013 on-premise. On a site collection's Pages library there is a Managed metadata column "Wiki Category" and allowed mulitple values. At the same time I have enabled multiple values for a managed property "ows_taxId_Wiki_x0020_Page_x0020_Categories".

However, the crawl log for most pages return error:

The content processing pipeline failed to process the item. ( Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index; ; SearchID = E2DFE16B-1234-4F1A-4567-02552018E642 )

According to SP2013, full crawl error: The content processing pipeline failed to process the item. ( Index was out of range. Must be non I think I did it correctly. What else could lead to the error? I have tried remove the Managed metadata column and the search is fine.