Pi4J v1.4 site generation leaves "$render.eval( $decoration.body.head )" in header

[savageautomate]

The site generation (mvn -N clean site) for Pi4J v1.4 leaves the text

$render.eval( $decoration.body.head )

in the top header/banner section of the page.

See: https://pi4j.com/1.4/index.html

[FDelporte]

Strange indeed, see it also happens on other sites like https://maven.apache.org/skins-archives/maven-fluido-skin-1.5/sidebar/