Isn't that because $flipped needs to be set for black?
Yes, adding this line fixed it:
setsystem flipped var mypieces;
The reason this was necessary is because this preset used the Alfaerie:Many set, which does include some flipped pieces even though most of the set is not flipped.
Yes, adding this line fixed it:
The reason this was necessary is because this preset used the Alfaerie:Many set, which does include some flipped pieces even though most of the set is not flipped.