Incorrect output for translucent linear gradient

[coolbutuseless]

ragg appears to not render translucent gradients correctly.

The following example was taken from https://www.stat.auckland.ac.nz/~paul/Reports/GraphicsEngine/definitions/definitions.html

Output from Cairo PNG

    grid.newpage()
    grid.text("Reveal", gp=gpar(fontface="bold", cex=3))
    grid.rect(gp=gpar(fill=linearGradient(c("white", "transparent"),
                                          x1=.2, x2=.8, y1=.5, y2=.5)))
    dev.off()

Expected output (from png(type = 'cairo'...)

Actual output from ragg::agg_png()

Nothing to see. the output PNG is totally white.

System

R4.5.0 on macOS

packageVersion('ragg')
[1] ‘1.4.0’

[coolbutuseless]

My apologies - this seems to have been corrected in the 1.4.0.900 development version.