When placing liquid lava on an ice block it doesn't melt.
How to reproduce
Start by filling a bucket with lava
Then freeze water and turn it into an ice block
Then pour the lava onto the ice block, its not gonna melt.
Update
Turns out I was using blue ice and not normal ice, blue ice doesn't melt but regular ice does.
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[media]
That's blue ice which doesn't melt

Turns out I was using blue ice and not normal ice, blue ice doesn't melt but regular ice does. So this report is invalid. Thanks for informing me tryashtar