Current behaviour: At character generation, if you've elected to create a specialist mage (including Wild Mage) and click the 'Pick For Me' button at the spell-pick screen, the character receives four known spells instead of three.
Expected behaviour: Specialists should only receive three known spells when selecting the 'Pick For Me' button.
Games affected: BG2, BGEE.
Notes: The bug affects BG2, as well. From testing, it looks like an extra known spell is granted for spell levels where one or more spells from the specialist's school is present. For all specialists apart from Wild Mage, this effectively means they nab a free known spell every spell level. Wild Mages, on the other hand, grab freebies only at the 1st and 2nd spell levels (from Nahal's and Chaos Shield, respectively).