Flow Background Rendering Issue: Incomplete Flow Backgrounds

[MarekSuchanek]

When using the Chart.js Sankey plugin, some flows have incomplete backgrounds, leading to visual gaps in the chart (see the bottom & top flow in the attached image). This issue seems to affect the rendering of the background for certain flows. Changing the size usually moves the issue to other flows / other parts of the same flow. Any ideas what could cause this (tried also suggestions from https://github.com/chartjs/Chart.js/issues/11310 but no luck)?

(Using chart.js 4.4.3 and chartjs-chart-sanked 0.12.1)