How to Reproduce:
1. Place an Oak Slab on the ground
2. Start flying
3. Set your position to be slightly above the Oak Slab, but still in the same block coordinates
4. Run the following command in chat and notice how it succeeds:
/execute if predicate {condition: "minecraft:entity_properties", entity: "this", predicate: {stepping_on: {block: {blocks: "minecraft:oak_slab"}}}} run say Test failedThis effects any blocks with a top face lower than a full block where the player can share the same block x/z coordinates (eg. Farm land, enchanting table, snow, etc.)
It also effects blocks such as the inside space of a door.
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Related bug: https://bugs.mojang.com/browse/MC-276755
Command/datapack users/map-makers need a reliable way to detect whether the player is colliding with a block, regardless of if they're in a special state like being teleported, if this bug is resolved using the same code path as {{is_on_ground}} then we're back to square one. Due to the inefficient nature of commands, being forced to do our own collision math is quite a burden and ideally could be avoided.