[MC-205187] Pistons works unproperly (This isnt solved)

The amethyst block is supposed to be transparent but when the lever is on top the piston gets powered.

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Please provide a screenshot of the setup with the F3 debug screen enabled.

Amethyst blocks are "transparent blocks", similar to glass - this is intentional.

When the lever is on top of the block the piston gets powered. Guess thats the bug

That's MC-108;