When FallingSand spawners spawn an entity, the block in which it spawned seems to disappear but only visually, because if, for example, it was a fire or lava block and a player in survival gets in contact with the invisble lava or fire block they take damage. The picture provided contains a FallingSand spawner modified to spawn lava. The lake is completely solid yet it appears as if pieces of it were missing.
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The way I made this spawner was I took a lava source, used sethbling's sandify filter on it, then on the FallingSand that filter creates I used sethbling's create spawners filter. This was all done in 1.7. After updating to the snapshot I noticed that the spawner had started spawning sand instead of lava so I took a vanilla FallingSand entity and checked it with and NBTeditor noticing that instead of the id tag in the snapshot it was using the Block tag. I then, using texelelf's NBT filter, added the Block tag to the already existing spawner. No command was used in the process so I don't know what command you want me to provide you with.
I've attached a screenshot of the NBT data the spawner has. The other two compounds in SpawnPotentials are the same as the open one just with different velocities on the y axis and spawndata is one of the three. I still don't know what commands I could provide, maybe upload the filters I used but thatt doesn't matter if the outcome is the spawner whose NBT data I just now attached.
When you load the world, the lake is solid.
Then a FallingSand entity spawns inside a block of lava. That block, in which the entity spawned, disappears visually. After a few minutes the result is as shown in the picture. Reloading the chunk makes the blocks reappear but as soon as a FallingSand entity spawns they disappear yet again.
/summon FallingSand 829 4 -409 {Time:2}
Here's a command for you. Change the coordinates then use it twice and then you'll see the first block become invisible. After that you should try walking through that seemingly air block. Now try placing a block there. See?
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
What you experience might be MC-72248
Please provide the exact command you've used.