Put water into a 1*1*1 block (in other words, water cannot flow out of the source block), and then put lava within the same block. The water block changes into lava block instead of obsidian.
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Please stop update the affect versions list for resolved ticket.

Please don't continue to update the affect versions list of this ticket.
Sorry for creating a duplicate. But so far I don't understand why is it intended? Shouldn't water/lava become obsidian all the time when lava/water is directly poured onto it? Why is it not happening when water/lava is a single source block? In my opinion there's no reasonable account for it.