Hold a bucket filled with lava, then right-click on the edge of the water. The client will show an empty bucket, but in reality, you can still release the lava. Right-clicking on empty ground will refresh it (release lava, empty the bucket).
Linked issues
duplicates 1
Comments 3
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We are tracking this issue in MC-307532, so this ticket is being resolved and linked as a duplicate.
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*Placing it by the water will produce obsidian