Consider the following CMake code

cmake_minimum_required(VERSION 3.30)

set(CMAKE_AUTOMOC ON)

find_package(Qt6 REQUIRED COMPONENTS Qml)

qt_add_qml_module(foo URI "org.kde.foo")

The project is in "/home/nico/workspace/qml-output-test".

Now create a build folder in /home/nico/workspace/qml-output-test/build

and configure the project with -DQT_QML_GENERATE_QMLLS_INI=ON

The generated .qmlls.ini file has buildDir="/home/nico", instead of the expected /home/nico/workspace/qml-output-test/build