Changing the sprite resource on a sprite component doesn't cancel the initial asset load callback

Repro project: https://playcanvas.com/project/890457/overview
Forum: https://forum.playcanvas.com/t/changing-sprites-on-initialize-doesnt-work-properly-without-preload/24589

The sprite that is assigned in the Editor is not preloaded (Base Image) and there is a script attached to it that changes the sprite to one that is preloaded on init (Final Image).

What is expected is that the sprite component keeps showing the Final Image

What actually happens is that it shows the Final Image and then changes 'back' to the Base Image:

• On startup, the sprite component tries to use the Base Image that isn't preloaded. As it's not loaded, it triggers an asset load
• The script changes the sprite to use Final Image which is preloaded and renders it on the screen
• The Base Image asset finishes loading and triggers the callback to assign the Base Image sprite to the sprite component

Reproduce the behavior with project 890457 and inspect the sprite component's handling of the unloaded Base Image and its asset-load callback. Verify the fix by changing to the preloaded Final Image during initialization and confirming that the later Base Image load does not replace it.