Dragonlance Adventures 1987, page 49. "There are no halflings or half-orcs in Krynn. Halflings who enter this world are considered kender and gain the special abilities (and obnoxious personalities) of kender in this world. Half-orcs would be considered magical freaks or aberrations as
there are no orcs in Krynn."
I think a bunch of their adjustments of people going in and out of Krynn are pretty nonsensical, but I feel that it was established in the setting book that the setting does not have half-orcs or orcs so the one novel including them is the outlier mistake.