This will happen if your composition is set to Ray-traced rendering. If you have not turned off the warning that pops up when you enable Ray-traced rendering you should have seen the warning.
The solution is to put the layers in your comp that require Ray Traced rendering in a separate comp and then nest that comp in a composition that uses Classic 3D so you can use blend modes on the extruded or bent layer. One workflow would be to pre-compose the extruded or bent layer, then change the main comp to Classic 3D. This limitation and NVIDIA deciding to change direction with their CUDA acceleration is the reason that Adobe has deprecated that feature and headed in a new direction.
A much more efficient workflow is to use Chieware and Cinema 4D lite tat is now included with AE. It not only gives you a much better solution it renders much faster and is still being worked on as a feature.
Rick Gerald!!! I love you man!!! You have solved my issue on that which I was trying to solve all day yesterday and today!!! Trying to reverse engineer with what I have made and you, Rick have solved. Something so simple which I have overlooked on my work to which was located when you create the new composition is just mind boggling. Kudos to you Rick! I'll be talking to you in the future when I come across issues like this.
Rick, you are incredibly awesome... I was going nuts.