The stroke is not working for any geometry!!!

I ran the following code and it does not drawing the stroke line:

```
from manimlib import *
class shape(Scene):
def construct(self):
circle=Circle()
self.add(circle)
```

would be glad to have your comments on this issue. I have also tried the following code:

```
from manimlib import *

class SquareToCircle(Scene):
def construct(self):
circle = Circle()
circle.set_fill(BLUE, opacity=0.5)
circle.set_stroke(BLUE_E, width=4)

self.add(circle)
```

and the stroke is not acting.

_Originally posted by @Shafagh777 in https://github.com/3b1b/manim/discussions/1455_

查看 manimlib/mobject/geometry.py 中的 Circle class 以了解 stroke 渲染如何運作。檢查 manimlib/scene/scene.py 中的 rendering pipeline 和 stroke 的 config 設定。執行提供的程式碼範例來重現問題，然後追蹤 stroke 的應用與繪製呼叫。

由索引模型根據 Issue 內容生成。