/placeblock lava may create lava that does not flow

and minecraft:flowing_lava, note only setblocked the middle one

Intended.

No, the block you place with a bucket is lava, not flowing_lava.

Flowing lava does not set things on fire, according to http://minecraft.gamepedia.com/Technical_blocks

But this "flowing_lava" that I /setblocked does.

What does it all mean?

Can somebody explain how this is intended?

@preben, if it is minecraft:lava, it won't flow outside
@ggxl: it's simple, minecraft:lava is just lava standing still not flowing outwards unless updated, minecraft:flowing_lava does flow outwards, regardless of update
you setblocked minecraft:lava so it shouldn't flow unless updated, and since you updated some of them, they flow, not all

@FVbico You don't seem to understand the difference between lava and flowing_lava. minecraft:lava is the source block and creates flowing_lava blocks around it. minecraft:flowing_lava is the flow itself. without a source block (minecraft:lava) the flowing_lava will disappear slowly. If buckets placed flowing_lava the lava would just disappear after a few seconds.

try to setblock it yourselve, do setblock ~ ~ ~ minecraft:lava
it won't flow
do setblock ~ ~ ~ minecraft:flowing_lava
it flows outside forever until you remove the placed block
who doesn't understand it here??
minecraft:flowing_lava is not only the flow, also the sourse
try then speak again!

Read http://minecraft.gamepedia.com/Lava .

sure you didn't try the commands, again:
try then speak again!

I'm serious

Maybe you're right, hard to test properly as testforblock on lava is quite buggy.

just try it with setblock ~ ~ ~ minecraft:flowing_lava, you'll see the lava you placed becomes the center and won't go away until removed, you can even use a bukkit on it

note, after it spreads, it inmedietly becomes minecraft:lava
so I guess we were both right in some way
added picture so you'll see

repeated same command every time

Ok, I tested as you told me to, and it seems to behave strangely (probably the reason I got confused) lava and flowing_lava look the same and act almost the same. Until you give the lava a block update, then it acts exactly like flowing_lava (unless there's a difference I didn't notice). but it's lava, it hasn't changed it's id to flowing_lava. The way I thought flowing_lava works is actually how flowing_lava 1 works.

But I did try to place a bucket of lava on the ground and use testforblock to see which id it had. it's lava not flowing_lava. I probably got a bit confused, sorry

If this issue RELATES to a bug, should it NOT be considered "works as intended?"

I read up on Fluids from the Wiki and it says fluids SHOULD update:
-ON CREATION
-If one of the 6 neighboring blocks' state changes.
-If its own level changes
-State changes that cause an update include:
-Adding or removing a block
-A neighboring block's level changes
-A redstone wire switches on or off

(I fixed the wiki to use American English...)

Lava/flowing_lava is more complicated than I thought, it's just confusing really. So if I got it right; lava buckets place flowing_lava 0, as soon as it flows it turns into lava. So.. flowing_lava 0 is just used as a way of making lava from buckets flow without needing a block_update? That makes sense right?