𝓞 is not extant here, but spacing in the lacuna has room for the subordinate conjunction that. This instance of that was omitted in the 1874 RLDS edition and restored in the 1908 RLDS edition. As discussed under Alma 20:23, the original text consistently has that after fearing in present participial clauses.
Summary: Maintain the subordinate conjunction that after fearing in Alma 46:29 (“fearing that he should not gain the point”).