PHP FFI nested struct bug

buggy.php

<?php

$ffi = FFI::load(__DIR__ . '/raylib.h');

$camera = $ffi->new('Camera2D');

$ffi->InitWindow(800, 600, 'Nawarian');

while (!$ffi->WindowShouldClose()) {
    $ffi->BeginDrawing();
        $ffi->BeginMode2D($camera);
        $ffi->EndMode2D();
    $ffi->EndDrawing();
}

$ffi->CloseWindow();

raylib.h

// .dylib is specific to MacOS, please replace with a .so or .dll if necessary
#define FFI_LIB "libraylib.dylib"

typedef struct Vector2 {
    float x;
    float y;
} Vector2;

typedef struct Camera2D {
    Vector2 offset;
    Vector2 target;
    float rotation;
    float zoom;
} Camera2D;

void InitWindow(int width, int height, const char *title);
bool WindowShouldClose(void);
void CloseWindow(void);
void BeginDrawing(void);
void EndDrawing(void);
void BeginMode2D(Camera2D camera); // <---- Buggy function
void EndMode2D(void);