There's a problem with requesting more than 10,000 items.

• With Stack Overflow it works just fine.
• But with Super User, Server Fault, etc. no items are returned for requests for items after the 10,000th and has_more is erroneously set to false.
• It doesn't matter whether page and pagesize are both 100 or page is 200 and pagesize is 50.

For example, this works:
    /2.2/search/excerpts?page=199&pagesize=50&q=security&site=serverfault

and has_more is true.

But this fails:
    /2.2/search/excerpts?page=200&pagesize=50&q=security&site=serverfault

and has_more is (incorrectly) false.

Reference this live site search, which shows 28,846 questions that should match.

Is this a bug or am I missing something?