Block and Stairs from custom Block give proper Buff when stepped on but Slab does not!

[Ioandar]

minecraft_version=1.20.1
yarn_mappings=1.20.1+build.10
loader_version=0.15.3
fabric_version=0.91.0+1.20.1

I made a custom block that gives a speed buff when stepped on
Block and Stairs from it work fine
-> Slab from it does not give Buff to player when stepped on!

Is this the right place to ask/report?
Am I doing it wrong?

cheers indu

´´´

public static final Block PAVING_WINDWALK = registerBlock("paving_windwalk",
        new PavingStoneTravelBlock(FabricBlockSettings.copyOf(Blocks.STONE).strength(4f)));

public static final Block WINDWALK_STAIRS = registerBlock("windwalker_stairs",
        new StairsBlock(ModBlocks.PAVING_WINDWALK.getDefaultState(), FabricBlockSettings.copyOf(ModBlocks.PAVING_WINDWALK)));

public static final Block WINDWALK_SLAB = registerBlock("windwalker_slab",
        new SlabBlock(FabricBlockSettings.copyOf(ModBlocks.PAVING_WINDWALK)));

´´´

[github-actions]

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