I have created a Sankey chart with data source as GA4 and 2 dimensions/nodes. those are Pages (Custom dimension of group of set of similar URLS) and event name, ,metrics is event count. Applied chart filter for event names.
The chart is visible for the first time I create it but breaks on the very first refresh. I tried with other combinations of dimensions as well but with no success. I assume this is the issue with chart itself, as no combination of nodes is working.