Need some pointers for investigation into size mismatch error in Sankey

Hi, I’m using holoviews as an extension to Bokeh to make sankey plot and run into an error coming from Bokeh min.js, which I managed to tail down to an error being thrown from a BitSet class defined in bitset.ts in the Bokeh packagage. There my debugging ends from the Bokeh side as I do not see how to bridge the gap from that object to the holoviews sankey object. In holoviews I tried debugging the sankeys object, but I so far cannot find any strange things happening.

Have you seen this issue before? Do you have pointers for further investigation?