[MC-122950] piston_top_normal texture doesn't change

I am using a resource pack that changes the piston_top_normal texture. However, the piston_top_normal texture is still on its default texture.

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Can you add the pack to the post? Or a link to download it?

This is likely due to the rename of a lot of the texture files in the 1.13 snapshots

Sure, I can add a pack link. https://www.planetminecraft.com/texture_pack/the-super-simplistic-redstone-resource-pack/download/file/11039632/
If the texture file was renamed (which seems plausible), why is the texture in the snapshot's folder still named piston_top_normal, and why does this not occur for sticky pistons?