You are running Minecraft 1.21, but the pack is actually for 1.20.5. Fix: Verify that the file name explicitly says 1.21 . If it does and the problem persists, contact the pack author. Some 1.21 snapshots changed block IDs.
Yes, but with a nuance. The Tricky Trials update introduced complex new block types—namely the Crafter (with its moving piston face), the Vault, and the Trial Spawner. Lower-resolution packs (32x, 64x) often make these new blocks look blurry or indistinct. File name- Clayful-Resource-Pack-128x-1.21.zip
If this is your own file, you can open the pack.mcmeta and pack.png inside the zip to confirm the exact author and description. You are running Minecraft 1