^{Update by Mega_Spud:}
Summary:
Falling blocks such as sand will break even when landing on blocks that have a full height hitbox, such as hoppers, upturned stairs, or top-half slabs.

Steps to Reproduce:

1. Place sand a few blocks above an upturned stair block

Observed Results:
The sand will break and drop as an item as it hits the stair block.

Expected Results:
I expected the sand to fall and land as a block, not drop as an item.

Screenshots/Videos attached: Yes

Notes:
List of blocks that cause the falling entity to break, that do not in Java:

• Hoppers
• Stair blocks (any orientation)
• Top-half slabs
• Cauldron
• Composter
• Shulker Box
• Iron Bars
• Glass Pane
• Trapdoors (iron and wooden)
• Normal Glass
• Stained Glass
• Leaves
• Ice (not packed ice)

=Fixed in 1.16

Additional info by Auldrick:
"Gravity block" as used here means any of the following blocks:

• Anvil
• Concrete Powder
• Dragon Egg
• Gravel
• Red Sand
• Sand

Although Scaffolding and Top Snow also fall under the influence of gravity, they behave very differently from the above and are reported in other tickets.

Original Description:
Gravity blocks are broken when they are falling on non-full blocks (wooden fences, slabs, stairs, cobblestone walls (mossy and regular) daylight sensors, end portal frame, cake, enchanting table, grasspath, hoppers, cauldrons, and hoppers). Galaxy tab 4