Infuse version 8.4 cannot record the position of a movie playback

When using Infuse to connect to the Emby server, movie playback progress is not recorded. After exiting playback for a period of time, or closing Infuse, the movie is automatically marked as finished. Resuming playback will then start from the beginning. This issue occurs on both Apple TV and iPhone, with the latest system version and iCloud and Trakt syncing selected. TV series playback progress is normal. Previous versions of Infuse did not exhibit this problem.
This problem occurs when playing ISO format movies, but not when playing movies of other formats.