Description:
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When you insert and row within MySQL with the php-mysqlnd library you'll get an empty result set as result.
Expected is; Inserted row id: {row number}
Current is; MySQL returned an empty result set (i.e. zero rows). (Query took 0.0002 sec)

Which means when you use:
mysqli_query("INSERT INTO demo (demoid,demoname,demovalue) VALUES ('','name','value')");
and you want to have the inserted id (with mysqli_insert_id();) you will get NULL or 0 response, that's incorrect. 

When we use an older php-mysql or php-mysqlnd library than 5.5.10 (now using 5.5.11 and tried with 5.5.10, but that's also broken) it works as expected.

Tested on multiple servers with same configuration.

Test script:
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<?php
$query = mysqli_query("INSERT INTO demo (demoid,demoname,demovalue) VALUES ('','name','value')");
$result = mysqli_insert_id();

echo $result;

Expected result:
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Returned ID

Actual result:
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Null or 0