I found this bug while playing Minecraft PE. When lava spreads into a new area and its level is high enough, it's not generating a new source block. When you try to scoop the new block with a bucket, it only picks up one of the source blocks that was originally placed. I tried this while trying to build a typical "lava generator" in which four source blocks of lava are placed around a center empty block. The lava spread should produce a lava block that is a source block itself, but nothing happens. The block even appears as a source block, but it cannot be scooped with a bucket. Is anyone else having this problem and if so, is there a way to fix it?
MCPE-78463
Lava is not generating source blocks when it spreads
Resolved
Invalid
1
According to the history section of https://minecraft.gamepedia.com/Lava, the kind of lava generator you are trying to build was only ever possible in Java Edition beta 1.9 prerelease 5. You can make a feature request on feedback.minecraft.net if you’d like to see this functionality implemented in the game.