New Eternal Incareration Map device does not track slain monsters correctly when in a party.

Ive just bought the Eternal Incarceration Supporter Pack and was excited to try out the new map device together with my friend. In the first map we noticed that the monster count seemed extremely low (25 normal monsters in the whole map, 16 magic monster etc.) and we realized this is because it only tracked the monsters killed by the map owner not how it says on the map device. "Tracks how many monsters are slain [...] in your maps". After leaving the map the correct kill count could be seen in the hideout map device menu. This has persisted in every map Ive run with more than one person.