False positive Rule css:S4666: Unexpected duplicate selector "", first used

It seems that the scanning of LESS files has an error regarding to rule css:S4666
when using “Mixins With Parentheses” in less like this
.test() {

and selectors with variables like this
@{foo}_bar {

they are all triggering a false positive “css:S4666: Unexpected duplicate selector “”, first used …”

SonarQube Server version is 9.5.0.56709

Hey there.

Thanks for the report. This will be fixed in SonarQube v9.6.