These two episodes are duplicates. There is a single 60 min episode rather than two 30 min episodes.
https://www.tvmaze.com/episodes/1704983/coronation-street-60x187-monday-26th-august
https://www.tvmaze.com/episodes/1704984/coronation-street-60x188-monday-26th-august
Source:
https://www.itv.com/hub/coronation-street/1a0694a9857