Water/Lava Colliding no longer gives off smoke particles
When water flows into lava, the hissing noise plays, but the accompanying smoke no longer appears. I suspect it's been like this since the Great SMP Switchover.
Not a tremendously huge deal, but does ruin the ability to make smoke machines.
Code analysis: https://bugs.mojang.com/browse/MC-6654?focusedCommentId=284677&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-284677 and https://bugs.mojang.com/browse/MC-10369?focusedCommentId=284639&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-284639