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Description
Running cells in the cube.ipynb notebook one by one, it works fine. Doing "restart kernel and run all cells" instead does not, many of the Viewers get "stuck" with no data, some don't show up at all.
Something to investigate, for larger notebooks cell outputs seem to be auto-collapsed? Or at least there is weird auto-scrolling behavior going on. Maybe the Viewer is not actually being started at all if it's not visible.
Because the data is not being received, it's worth investigating that entire "pipeline" to see where it gets stuck.