AltImages become visible after resize when duration is specified

[techfg]

Describe the bug
When invoking the resize method and specifying a duration, any AltImages attached to ImageMapster for the bound image become visible.

To Reproduce
Steps to reproduce the behavior:

1. Open AltImages example
2. Execute $('img').mapster('resize', 1000, null, 25, null) in console
3. 5 images are now visible - the original image and the 4 altimages that are pre-loaded

Expected behavior
The AltImages should remain hidden and not visible.

Screenshots
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Desktop (please complete the following information):
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Smartphone (please complete the following information):
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Additional context
The reason for the issue is that IM calls animate when duration is specified and the animate call is "showing" the element as part of the animation.