DataSet Ticker Slides are empty

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I tried to investigate this further and found some small things by having a look on the html code of the layout preview i-frame:

First, although the “Number of Items” in the DataSet Ticker Widget is set to 2, it seems that there are 3 slides in the layout. Maybe, this has something to do with this error which seems to be under investigation: Dataset Single Row Duration Timing

Second, while watching the code, you can see the changing css-values (z-index, display, visibility). There are states in the layout preview where a slide is in the foreground (z-index=98), but the visibility value is not changed to visible. I think this causes the black screen for some slides. I added some screenshots, the relevant lines are blue highlighted:

  1. Correct: One Slide is visible

    correct_view
    correct_view1530×924 352 KB

  2. Error: No slide is visible because all visibility:hidden is set for all (2 different cases)

    visibility_error
    visibility_error1530×924 351 KB

    visibility_error_2
    visibility_error_21530×924 352 KB

Is anybody able to reproduce this issue?