Line Marker Provider not executed

I don’t know why, the code is not executed

<codeInsight.lineMarkerProvider language="JAVA" implementationClass="com.leaniss.smartchat.inlay.MyLineMarkerProvider2"/>
package com.leaniss.smartchat.inlay;



/**
 * @Description //TODO
 * @Date 2023/12/6 18:17
 * @Author yongwangat
 **/
public class MyLineMarkerProvider2 implements LineMarkerProvider {
    @Nullable
    @Override
    public LineMarkerInfo<?> getLineMarkerInfo(@NotNull PsiElement element) {
        // Only work with method identifiers (to reduce unnecessary checks)
        if (element instanceof PsiMethod && element.getFirstChild() != null) {
            PsiMethod method = (PsiMethod) element;
            // Check if the method name contains "test"
            if (method.getName().contains("test")) {
                // Provide an appropriate tool tip message
                Function<PsiElement, String> tooltipProvider = e -> "Test method: " + method.getName();
                return new LineMarkerInfo<>(
                        element,
                        element.getTextRange(),
                        AllIcons.RunConfigurations.TestState.Run, // IntelliJ's test icon
                        tooltipProvider,
                        null, // No click action
                        GutterIconRenderer.Alignment.LEFT
                );
            }
        }
        return null;
    }


}