Here the 1837 edition switched the order of the auxiliary verb shall and the subject pronoun ye, from “in that day shall ye say” to “in that day ye shall say”. Either the inverted or the noninverted word order is possible after the sentence-initial adverbial phrase “in that day”, as in the following examples where the subject is a pronoun (the ones with the inverted order are each marked with an asterisk):
The first three, citations from Isaiah (the King James text), also show the variation in word order. Here in Helaman 13:33, both 𝓟 and the 1830 edition have the same inverted word order, so 𝓞 must have also read this way.
Summary: Restore the inverted subject-verb word order in Helaman 13:33 (“yea in that day shall ye say…”).