How to process concurrent filings?

fatpig

Registered Users (C)
Saw a bunch of concurrent filings where I-140 has been approved without I-485 approval from late Oct. on.
How does NSC handle concurrent filings? Do they just process some of the cases like non-concurrent filings, that is, approves the I-140 and put the I-485 to the I-485 queue?
Really confusing.
 
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