setPointerCapture causes uncaught error

Version

• Phaser Version: v3.90.0

• Operating system: macOS

• Browser: *

Description

I would like to allow users to drag things around and continue the drag even if the mouse (temporarily) leaves the window. The API for this is setPointerCapture. But when I use this API, Phaser crashes with Uncaught TypeError: can't access property "x", n is null as soon as the mouse leaves the window.

Example Test Code

https://codepen.io/Amzd/pen/WbQjJEQ

The important part of the codepen is:

this.input.on('pointerdown', function(e) {
    document.querySelector("canvas").setPointerCapture(e.pointerId);
})

Additional Information

There is an alternative API called pointerLock which Phaser does support but it gives a popup "example.com has taken control of your pointer. Press Esc to take back control" while setPointerCapture does not, because it only captures until you release the mouse.

https://phaser.io/examples/v3.85.0/input/mouse/view/pointer-lock

Start by running the linked CodePen and reproduce the error with the setPointerCapture call in the pointerdown handler. Trace Phaser's pointer input handling when the captured pointer leaves the window, then verify that dragging continues without an uncaught error while the pointer remains captured.