glGetActiveAttribute() 读取了错误的属性索引？

最小可重现示例：

#include <iostream>
#include "glad.h"
#include <glfw3.h>

int main(int argc, char* args[])
{
    glfwInit();

    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    auto window = glfwCreateWindow(800, 600, "Example", NULL, NULL);
    glfwMakeContextCurrent(window);

    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
        throw new std::runtime_error("Failed to initialize GLAD");

    const char* vertexSrc = "#version 330 core\n"
        "in vec3 APos;\n"
        "in vec3 VertCol_In;\n"
        "out vec3 VertCol;\n"
        "in vec2 TexCoord_In;\n"
        "out vec2 TexCoord;\n"
        "void main()\n"
        "{\n"
        "   gl_Position = vec4(APos.x, APos.y, APos.z, 1.0);\n"
        "   VertCol = VertCol_In;\n"
        "   TexCoord = TexCoord_In;\n"
        "}\0";

    auto vertexShader = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertexShader, 1, &vertexSrc, NULL);
    glCompileShader(vertexShader);

    const char* fragSrc = "#version 330 core\n"
        "out vec4 FragColor;\n"
        "in vec3 VertCol;\n"
        "in vec2 TexCoord;\n"
        "void main()\n"
        "{\n"
        "   FragColor = vec4(VertCol.x,TexCoord.xy, 1.0f);\n"
        "}\0";

    auto fragShader = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragShader, 1, &fragSrc, NULL);
    glCompileShader(fragShader);

    auto prog = glCreateProgram();
    glAttachShader(prog, vertexShader);
    glAttachShader(prog, fragShader);
    glLinkProgram(prog);

    auto aPos_layout = glGetAttribLocation(prog, "APos");
    auto vertCol_in_layout = glGetAttribLocation(prog, "VertCol_In");
    auto texCoord_in_layout = glGetAttribLocation(prog, "TexCoord_In");

    GLenum type;
    GLsizei length;
    GLint size;
    const GLuint bufSize = 16;
    GLchar bufA[bufSize];
    GLchar bufB[bufSize];
    GLchar bufC[bufSize];

    glGetActiveAttrib(prog, aPos_layout, bufSize, &length, &size, &type, bufA);
    std::cout << "Name at aPos_layout ("<<aPos_layout<<"): " << bufA << "\n";

    glGetActiveAttrib(prog, vertCol_in_layout, bufSize, &length, &size, &type, bufB);
    std::cout << "Name at vertCol_in_layout ("<<vertCol_in_layout<<"): "<<bufB << "\n";

    glGetActiveAttrib(prog, texCoord_in_layout, bufSize, &length, &size, &type, bufC);
    std::cout << "Name at texCoord_in_layout ("<<texCoord_in_layout<<"): " << bufC << "\n";

    return 0;
}

据我理解glGetActiveAttrib()及其glGetAttribLocation()工作原理，执行此操作的输出应该是：

Name at aPos_layout (0): APos
Name at vertCol_in_layout (1): VertCol_In
Name at texCoord_in_layout (2): TexCoord_In

但事实并非如此。输出结果如下：

Name at aPos_layout (0): APos
Name at vertCol_in_layout (1): **TexCoord_In**
Name at texCoord_in_layout (2): **VertCol_In**

请注意和处的名称vertCol_in_layouttexCoord_in_layout是如何互换的。虽然我显然已经知道在这个 MRE 中获取索引的属性名称，但我在这里试图说明的一点是glGetAttribLocation()的return值或glGetActiveAttribute()的第二个参数并未按照文档操作。

来自glGetAttribLocation()的文档：

参数

程序
指定要查询的程序对象。

index
指定要查询的属性变量的索引。

来自glGetActiveAttribute()的文档：

glGetAttribLocation查询程序指定的先前链接的程序对象以获取由名称指定的属性变量，并返回与该属性变量绑定的通用顶点属性的索引

这仅仅是 GLFW/OpenGL 中的一个错误吗？我无法想象这种情况会如何发生，因为文档中的意图非常明确。或者某些明显的问题出在了我不知何故视而不见的地方，作为一个对 OpenGL/GLFW 还很陌生的人，我愿意相信这一点。