Read problem with timeslice key default

For the file KM3NeT_00000007_00002625_3slices.root (DetID: 7 - RunID: 2526) the DAQReader shows 'default' as only timeslice key. When it is tried to access the timeslices by reader.timeslices.stream('default', 0) the error TypeError: __init__() missing 1 required positional argument: 'stream' is thrown.