NOTATIO

While perusing a critical edition of Bruckner's Psalm 150, I noticed that several figures in a solo soprano line are beamed in the modern fashion, i.e. with two groups of four eighth notes in 4/4. This is preserving the notation from the manuscript, in fact: However, after a few bars, he goes back to the style of beaming he uses throughout the rest of the piece: Bruckner was usually extraordinarily meticulous with his scores, so I've been looking for some justification for this, but I haven't been able to find one yet. The phrasing seems identical between the "irregularly" beamed section and a similar passage a few measures later (not in either image) that is beamed as per the era.

Anyone have any ideas what this could be representing?

Judging from the many corrections in the MS in the soprano solo section, some pasted on, it appears that the section was highly modified later. This might have distracted Bruckner and caused the errors.