a solution 🎉
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specifically, this stackoverflow answer has the workaround to solve this apparent bug in Chromium‘s implementation of the SVG 1.1 standard
in d3.sankey.js, we want to alter the return value of the path generator to ensure that we never return perfectly straight paths. inserting this this new moveto command "M" + -10 + "," + -10 on the first line does just that:
return "M" + -10 + "," + -10
+ "M" + x0 + "," + y0
+ "C" + x2 + "," + y0
+ " " + x3 + "," + y1
+ " " + x1 + "," + y1;an iteration on by Patient Flow Sankey Particles from @micahstubbs
see also the earlier version with 13 layout iterations that happens to avoid any perfectly straight paths.
and also this earlier bug reproduction example with 14 Sankey layout iterations that does produce a couple of those problematic-for-Chromium perfectly straight SVG paths
inspired by the blog post Data-based and unique gradients for visualizations with d3.js and associated example Data based gradients - Simple - Solar system from @nadiehbremer