I was attempting to build a tower-like structure on which I intended to place source lava blocks at the top in such a manner that the lava would spread down the tower's sides. However, no matter what situation I try, when I remove the source lava block, the lava always stops dissipating at some point (usually on the floor) and I am left with lava which never disappears completely. I have attached my save folder for the world I was working on and left a sign with instructions.
Other thoughts: Behavior of fluids has been very frustrating to all Minecraft players for a long time now and it would be great to see an improvement on it soon.
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This bug is there for several versions. Would be nice to finally see it fixed.
EDIT: It seems like big pieces of flowing lava act like source blocks. Flowing lava will disappear if it's "cut in this fashion:
X = stone/gravel/whathever
L = flowing lava
x|L|x|L|x
L|x|L|x|L
x|L|x|L|x
Hope you get what I mean.
The point is that when you remove the placed lava again and it ebbs away along the contour it sometimes leaves lava source blocks (block ID 10) behind. Obviously, those will never go away unless manually removed. You can test that if you have SinglePlayerCommands (with WorldEdit included) and optionally WECUI. Put a selection around where the lava got stuck and use the //distr command. That will show you how many lava source blocks (ID 10) and stationary lava blocks (ID 11) are in the selection.
However, as to why it does that I can provide no insights.
I do not see how my bug report is "resolved". The supposed "duplicate issue" (https://mojang.atlassian.net/browse/MC-4631) has no relation with the problem reported by me.
Yes, it may be the same issue
However, if both are labeled as duplicates, then it won't be fixed.
In the other it is called to be correct behaviour, however this is something that I, and probably most of the others who contributed to this, call to be a bug, or a part of the game that needs revisiting
In the other issue, the comment refers to the wiki (which is community-run and not a 100% reliable source of information), which mentions that lava will eventually disappear when there are no source blocks - I do not doubt that.
What we are seeing instead is that the lava creates new source blocks in certain circumstances (further down the lava stream) that were not created by the player and which obviously don't disappear by themselves and must be manually removed.
That's what happens in the attached Sandbox savegame and it's also what I see a lot in my games.
Anyway, we will probably not get any attention here, since this issue is marked as "Resolved". And I'm not 100% sure if the other issue (MC-4631) is exactly the same, as its description seems a little vague to me.
@Yamaraj maybe - as original reporter of the issue - you can reopen it and clarify that what we're experiencing isn't explained by the wiki?
From the wiki: "Contrary to popular belief, lava cannot remain forever with out a source block. It may take several hours, but it will always disappear." It likely will just take a long time, so I would say this bug is "By Design"/"Won't Fix".