In the VE Current Open Tasks phlog report (http://phlogiston-dev.wmflabs.org/vec_open_by_category.html)
T189821 is categorized as Visual Editor Other under the categorization rule:
6. Categorize as VisualEditor Other all tasks in project Current work and not in any rules above
However, it should have been caught by the categorization rule:
2. Categorize as Up next all tasks in project Current work and in a column whose title includes the text Up next
UPDATE: Tentative diagnosis in comments; high-effort fix.