I downloaded a mcpe map from mcpecheats, and in that map, where there was no bedrock, the player and mobs could walk on the bottom of the world. I addition, lava acted as if it was on normal dirt...
This occured on multiplayer
MCPE-2384
On online map downloaded to iPad, in survival you can walk in the bottom of the world
Resolved
Invalid
0
(Unassigned)
Unconfirmed
Tablet - iOS - iPad 2
MAPS, bottom, downloaded
0.6.1
Retrieved
Resolving as invalid since there's no way to rule out the possibility of a layer of invisible bedrock having been edited in. If you can confirm that this isn't just a layer of invisible bedrock, we can reopen this.