Markup Will Alter Image Brightness

How do I disable the "Markup Will Alter Image Brightness" change? I've used Preview to add boxes, lines and text to images for 15 years and I genuinely view it as one of the most useful features on my mac. Now when I try to apply markup it makes my image drastically darker. I'd say in its current form Markup in Preview is effectively useless and a massive step back in functionality. It's not obvious to me how to disable it, or if it's even possible.