When using Vibrant Visuals - the Colour of Lava is dependent on the Brightness setting.
How to Reproduce:
Load any world.
Observe the colour of Lava at various Brightness settings with “Fancy” graphics.
Switch to Vibrant Visuals and repeat the same process.
Expected Results: The lava should stay the same colour across all brightness levels. Just as it does in the Fancy or Simple Graphics mode.
Actual Result: The lava is an extremely dark Red with aprox. 0-30 brightness. And then after this it becomes the same colour as Fancy graphics until Maximum brightness.
Please provide screenshots of how it looks to you.