How to Fix ggdensity::geom_hdr() Errors with Single Point Groups in R

Understanding the Error in ggdensity::geom_hdr()

When working with spatial or continuous bivariate data in R, the ggdensity package provides a powerful way to visualize density using Highest Density Regions (HDRs) via geom_hdr(). However, if your dataset contains categorical groups (factors) where a group has only one observation, you will likely encounter this error: