Scribe 2 of 𝓟 here wrote cursed rather than the correct caused. The two words are visually similar. In addition, the verb curse was probably prompted by the preceding verbs revile and spit. Oliver Cowdery, in his proofing of 𝓟, emended the text to the correct caused. A similar scribal error is found later on in this chapter; once more Oliver made the correction:
These errors by scribe 2 seem to indicate tiring on his part, especially since in each case the resulting text was quite improbable.
Summary: Accept Oliver Cowdery’s corrections in 𝓟 of cursed to caused in Alma 8:13 and favor to food in Alma 8:20.