`sizeof` が C 関数の内側と外側で異なる配列サイズを与えるのはなぜですか?

#include <stdio.h>

void test(int arr[]) {
    int arrSize = (int)(sizeof(arr) / sizeof(arr[0])); // Incorrect
    printf("%d\n", arrSize);
}

int main() {
    int point[3] = {50, 30, 12};

    int arrSize = (int)(sizeof(point) / sizeof(point[0])); // Correct
    printf("%d\n", arrSize); // Prints 3

    test(point);

    return 0;
}

void test(int arr[], size_t elems) {
    int arrSize = elems;
    /* ... */
}

int main() {
    int point[3] = {50, 30, 12};
    /* ... */
    test(point, sizeof(point) / sizeof(point[0]));
    /* ... */
}