highlight-inset doesn't work

[Andrew15-5]

#import "@preview/codly:1.3.0": codly, codly-init
#show: codly-init
#codly(
  highlight-inset: (x: 0pt, y: 0.32em),
  highlights: ((line: 2),),
)
#raw("a\na\na\n", block: true)

According to the manual (2.47.1) highlight-inset.x == 0pt will remove the horizontal movement of the line/highlighted code, yet any configuration of highlight-inset results in the exact same output.