Oliver Cowdery initially skipped the subordinate conjunction that here in Mosiah 10:4, but he immediately corrected the the that he first wrote by overwriting the e with a and then continuing inline by writing the final t for the word that. Perhaps he expected the text to read “and I did cause the men that they should till the ground”. Either reading is possible in the Book of Mormon text, as explained under 1 Nephi 17:46. The critical text will continue with the corrected reading in 𝓟.
Summary: Maintain in Mosiah 10:4 the corrected reading in 𝓟: “and I did cause that the men should till the ground”.