Steps to reproduce

1. In Qt Creator, ensure that the QML Language Server is enabled, but "Use from latest Qt version" is disabled
2. Load a Qt Quick project (I tested with the example at QTBUG-137199)
3. Configure the project to use multiple kits (I tested with Qt 6.8.4 + 6.9.2 + 6.10.0-beta3 for Desktop. Debug mode is used for every version)
4. Open Main.qml
5. Click the Language Server tool button (top-right corner of the Code Editor) to check which version of qmlls is active
6. Switch to different kits, repeating step #5 with each switch

Expected outcomes (QtC 16)
Each time a different kit is selected, the old instance of qmlls stops running and a new one (based on the newly-selected kit) runs immediately.

Actual outcomes (QtC 17)
qmlls could get stuck at a specific version. For example, even when I switch to Qt 6.8.4 or 6.10.0, qmlls 6.9.2 remains active.