As the title states, I have one block that is not being rendered correctly by Slidur's Shaders. I have already asked Slidur on this, and he confirms that all syntax in his blocks.properties is correct. As he already had his own blocks.properties, I added the line included in the blocks.properties file from this mod to the shaderpack. All blocks are working except for one. I tried pinpointing that specific block with Hwyla, but I can't tell if I am getting the block or the block underneath. I think it may be block /2/1 but I can not confirm that. Here are a couple of links: blocks.properties and a screen shot of the block in question: https://imgur.com/a/SFThVHA

It should also be noted that I am running minecraft 1.12.2, forge 14.23.5.2780, Optifine E2, and streams 0.4.4

I'm not 100% sure but I think your un-shaded block is actually the vanilla flowing water, which forms the top of Streams "waterfalls" where the river goes down 1 block. (It's not always obvious because the upstream blocks are very low). Does vanilla water outside of Streams rivers also fail to render shaded in your world?

Looking at your blocks.properties file I wonder if your block.10008 entry for Streams is overwriting the preceding entry for flowing_water. Try combining both entries into one and let me know if this still happens.