Verification builds:
1.2.5.15 Retail
Summary:
Having a layer of transparent blocks (such as glass) will prevent endermen spawning in on valid platforms below, even if the glass layer is much higher than the platform.
Steps to Reproduce:
Travel to an area over the void in the end
Set difficulty to Peaceful
Place a single layer of glass at y100
Place a single layer of end stone directly below the glass at y50
Set difficulty to Hard
Wait for mobs to spawn on the end stone platform
Observed Results:
The glass prevents any spawning on the valid blocks below. Endermen will not spawn on the platform all the while there is glass above.
Expected Results:
Glass should not prevent endermen spawning on valid blocks below.
Screenshots/Videos attached: Yes
Notes:
Tested with other transparent blocks, they also prevent mobs spawning below: Leaves, pistons, fences, but apparently not bottom-half slabs (see MCPE-28626)
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Can confirm on iphone x