Magma blocks do not melt ice or snow

The bug

Magma which is an extremely hot block doesn't melt ice or snow.

Steps to Reproduce

• Build the setup as shown in the attachment below. setup.png
• Replace the diamond block with a magma block.
• Wait around one minute and watch the ice blocks closely, and take note as to whether they melt or not.

Observed Behavior

Magma blocks don't cause ice or snow to melt.

Expected Behavior

Magma blocks would cause ice and snow to melt.