Lava and water don't turn into stone or cobblestone when they act together from the edge of both of them

Details
When you place lava and water far from each other and the end part of each of them acts together they don't turn into stone or cobblestone

How to Reproduce
When you place lava and water far from each other and the end part of each of them acts together they don't turn into stone or cobblestone

You need to fix that because this effects the player's gameplay