On desktop, each subaction row shows who it is assigned to (avatar) and its date range. On the mobile app, the Subactions list only shows the title, a completion checkbox, and a chevron.
The team in question uses subactions to track vacation / PTO / time off on one parent card, with one child per person and date range. On mobile you cannot tell who a row belongs to without opening every subaction. Some people work around this by putting names in the title (for example Vivi > PTO - July 23).
Please show the assignee avatar and the date / date range on each subaction row in the mobile action card, the same way desktop does. Tapping the row to open the full subaction should still work.