Spring中Thymeleaf Security的sec:authorize标签失效求助

在Spring Boot 3.1.0项目中集成Thymeleaf Security，添加依赖后发现sec:authorize标签完全不生效。已查阅大量相关问题，要么内容过时，要么是用户遗漏依赖；参考无需额外配置的简易教程也未能解决问题。

项目使用Java 17，代码托管在GitHub，暂未推送最新改动，若需要补充缺失文件可提供。

pom.xml内容： #

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.1.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>sia</groupId>
    <artifactId>CafeBarApplication</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>CafeBarApplication</name>
    <description>Cafe Bar Example</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf.extras</groupId>
            <artifactId>thymeleaf-extras-springsecurity5</artifactId>
            <version>3.1.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-oauth2-client</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

HTML页面代码： #

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
    xmlns:sec="http://www.thymeleaf.org/extras/spring-security">

<head>
    <title>Cafe Bar</title>
</head>

<body>
    <h3 th:text="'Welcome' + (${fullname} ? ', ' + ${fullname} + '!' : '')" />
    <img th:src="@{/images/cafeIcon.png}" />
    <form method="POST" th:action="@{/logout}">
        <input type="submit" value="Logout" />
    </form>
    <div sec:authorize="!isAuthenticated()">
        This content is only shown to unauthenticated users.
    </div>
    <div sec:authorize="isAuthenticated()">
        This content is only shown to authenticated users.
    </div>
    <div sec:authorize="hasRole('ROLE_ADMIN')">
        This content is only shown to administrators.
    </div>
    <div sec:authorize="hasRole('ROLE_USER')">
        This content is only shown to users.
    </div>
</body>

</html>

实际问题表现： #

以USER角色登录后，所有带有sec:authorize标签的div内容全部被显示出来，包括未认证用户、管理员专属内容：

内容的提问来源于stack exchange，提问作者sedub01