Inaccurate kanken data

[kishimoto-tsuneyo]

The kanjidict table has 6505 kanken kanji:

SELECT count(kanji) FROM kanjidict WHERE kanken IS NOT NULL;
⇒ 6505

However the official 漢検 kanji dictionary only has 5647 distinct kanji plus 642 kyujitai (for 6289 total kanji).

[mifunetoshiro]

I believe these extra ones are all kanken level 1 国字, I can't remember the source, but it listed them as 1級.