In the Block Tag Sand there's a duplicate entry of "minecraft:suspicious_sand".
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Comments 2
Thank you for your report!
We're tracking this issue in MC-264431, so this ticket is being resolved and linked as a duplicate.
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I can confirm this issue in both Minecraft 1.21.3 and Minecraft snapshot 24w44a. (I thought I brought this up once but never reported it, but I couldn't find where I mentioned it...)