Battlegrounds, Macbook - "Start MMR" -> "Current MMR" not working

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Using Macbook Air M2 with MacOS Version 14.0 (23A344)

Playing Hearthstone Battlegrounds Duos

Using the Mac-App of Deck Tracker

1) Using Tracker to show my 'start MMR' and the change to 'current MMR'

Expected behaviour: Start MMR shows number relating to the start of my session, meaning: opening the app
Actual behaviour: Start MMR updates after every game, eventhough deck tracker has not been closed

Note: Current MMR changes as expected

2) Using Tracker to show my match history, including boards and MMR change

Expected behaviour: A growing listing of rows that show the hero name and the MMR gained or lost within the past game
Actual behaviour: No games are listed, area reads "No games played this session"

Note: I have played matches

Additional Info

Deck Tracker still worked on Sept. 6th. Within a session suddenly deck tracker went into background. Only after repeatetly clicking on the app it appeared again. After restarting the app, MMR did not change as described above. Even after reinstalling, still no session is being correctly detected

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Update: It seems that the issue is related to the game mode "Duos". Tracker seemed to calculate the MMR change of solos (I always saw a different number pop up after each game for 1 second, until it updated back to my Duos MMR. Apparently Tracker was looking for solo games and since I played none, it doesnt list them in latest games and then switches back to Duos-Data and updates "Start" MMR (as well as Current MMR).
After playing some solo games and switching back to duos, the tracker seems to work again (for now)