sonar.projecBaseDir property ignored with plugin is installed

[Nereide-lab]

Hi, i'm new to sonar, and still testing things.
I noticed that with the groovy plugin installed the sonar.projectBaseDir seems to be ignored.
The sonar then scans the whole computer (localy i get info log about to much links in .steam/... folder.

I use the latest plugin version (sonar-grovy-plugin-1.8.jar) downloaded from git and copy past in extensions/plugin/ folder
And the sonar scan gets lauched from gradle task

./gradlew -v
------------------------------------------------------------
Gradle 6.5
------------------------------------------------------------

Build time:   2020-06-02 20:46:21 UTC
Revision:     a27f41e4ae5e8a41ab9b19f8dd6d86d7b384dad4

Kotlin:       1.3.72
Groovy:       2.5.11
Ant:          Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM:          11.0.17 (Oracle Corporation 11.0.17+1)
OS:           Linux 5.15.81-1-MANJARO amd64

// build.gradle
plugins {
    id 'application'
    id 'groovy'
    id 'eclipse'
    id 'checkstyle'
    id 'maven-publish'
    id 'at.bxm.svntools' version '2.2.1' // Don't update as long as we don't use Java 11, it's needed by version 3
    id 'org.asciidoctor.convert' version '2.4.0' // About org.asciidoctor.jvm.convert as it says itself: "If you need a production-ready version of the AsciidoctorJ plugin for Gradle use a 1.5.x release of 'org.asciidoctor.convert' instead"
    id 'org.owasp.dependencycheck' version '6.3.1' apply false
    id 'se.patrikerdes.use-latest-versions' version '0.2.17' apply false
    id 'com.github.ben-manes.versions' version '0.39.0' apply false
    id "com.github.ManifestClasspath" version "0.1.0-RELEASE"
    id "com.github.node-gradle.node" version "3.1.0"
    id "org.sonarqube" version "3.5.0.2730"
}

Would you have an explanatoin or workaround ?
If there is any more info needed please let me know