Possibly public saturation after the latest Knives Out. Loss of interest in Christie since her retirement?
All three are beautifully produced, entertaining films.
I've always enjoyed (and respected) Kenneth Branagh's work, and that continues with his (first?) three loose adaptations of the work of Agatha Christie.
A Haunting in Venice is viscerally quite different from the previous two - Murder on the Orient Express (2017) and Death on the Nile (2022)...