"Shimmer" animation doesn't work when used on a loading widget?

I'm trying to create a loading widget that uses the shimmer animation, but for some reason, any widget that i apply the shimmer effect to, the entire widget won't appear when i use it as a loading widget for a query while testing it in run mode. When I apply a different animation to the same widget with no other changes, it appears as the loading widget with no problem.

Has anybody run into this issue or know of a fix? I'm aware that I can configure my own shimmer, but the animation is much smoother than I'd be able to get it and a lot easier to apply, so it'd be much more preferable to use this effect for loading widgets. Any help? Thanks!

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