Here Oliver Cowdery initially omitted the yea as he copied the text from 𝓞 into 𝓟. His supralinearly inserted yea was supplied almost immediately (there is no change in the level of ink flow). The critical text will accept the corrected reading in 𝓟 since either reading, with or without the yea, works.
Summary: Maintain in Alma 13:22 the corrected reading in 𝓟: “yea and he doth sound these glad tidings among all his people”.