AVM2: HitTestObject with SimpleButton not working

[CUB3D]

Describe the bug

As shown by the attached sample, trying to perform a hitTestObject, where one value is a SimpleButton always fails.

Adding some additional logging around the current hit test logic, shows that the bounds of the button are always
BoundingBox { x_min: Twips(0), y_min: Twips(0), x_max: Twips(0), y_max: Twips(0), valid: false }

This causes an issue in Upgrade Complete!, where neither the Play button, nor the Back button in the Ship Builder work. This also might be the cause of the issue that prevents collecting money.

(In this SWF, click to move the green clip)
UGC Bug.zip

Expected behavior

hitTestObject behavior matches Flash Player

Affected platform

Desktop app

Operating system

Linux

Browser

No response

Additional information

No response

[CUB3D]

After playing about with this for a while, I think I've found a solution to this issue, currently the bounds of SimpleButton are taken as empty here.

Changing this to

BoundingBox {
    x_max: Twips::ZERO,
    y_max: Twips::ZERO,
    x_min: Twips::ZERO,
    y_min: Twips::ZERO,
    valid: true,
}

Makes the button clickable (somewhat, the mouse seems offset but I doubt that is related). This also fixes the issue in the linked swf.

[n0samu]

Fixed by #8744