Menu briefly flashes at top-left corner before opening at correct position

### Current behaviour

When using the Menu component from React Native Paper, a visual glitch occurs:
Whenever the menu is opened dynamically using coordinates (e.g., anchor={{ x, y }}), a semi-transparent duplicate of the menu briefly flashes at the top-left corner of the screen (position (0, 0)) before rendering at the correct anchor position.

This issue happens consistently when opening menus that are positioned using touch event coordinates or dynamic measurement values inside a list (FlatList).

### Preview

https://github.com/user-attachments/assets/7b9f5b7a-fcfe-4947-b622-16afd988dd20

### Expected behaviour

The Menu should appear only at the specified anchor position immediately upon opening.
There should be no flicker, flash, or duplicate menu rendered at (0, 0).

### Actual behaviour
1. When tapping a menu trigger (IconButton), the menu opens correctly at the desired position.

2. However, just before that, a brief flash of the menu appears at the top-left corner of the screen.

3. The flicker looks like a low-opacity duplicate and disappears within a fraction of a second.

### How to reproduce?

1. Render a list of items (e.g., with FlatList).
2. For each item, display a trigger button to open a Menu.
3. Use dynamic touch coordinates or measurements to position the menu
`const handleOpenMenu = (e) => {
const { pageX, pageY } = e.nativeEvent;
setMenuPos({ x: pageX, y: pageY });
setMenuVisible(true);
}
`
5. Open the menu.
6. Observe a quick flash at the top-left corner before the menu displays correctly.

### Code Snippet
##### minimal reproduce example
` setMenuVisible(false)}
anchor={{ x: menuPos.x, y: menuPos.y }}
>
{}} title="Edit Item" />
{}} title="Delete Item" />
`