Diffuse color looks different in 2D and 3D/Material previews

Steps to reproduce:

• Create a 3D project
• In Material Editor, set diffuse color of default material to #266a1ba9
• In 2D the cubeModel looks orange and in 3D and material previews it looks purple, see attached picture
• -> Would expect to look the same
• Maybe something to do with transparency since before I set the transparency to the color it worked as expected, looking the same in 2D and 3D