When applying an arc effect shouldn't the mask dictate how the arc effect works and not the larger contents of the mask?

The results I am getting now appear to be possibly impacted by the larger/complex contents of the mask.

I have used a larger arc amount of 15% in the images below to exaggerate the difference I am seeing between the simplified design/mask and the second design with a larger pattern inside the mask.

Is this working as intended or is this an issue?

Computer Specs:
macOS 10.15.4
iMac (Retina 5K, 27-inch, Late 2015)
Processor: 4GHz Quad-Core Intel Core i7
Memory: 16 GB 1867 MHz DDR3
GPU: AMD Radeon R9 M395 2 GB
GPU Performance Enabled in Illustrator. App is too slow when disabled.

Jimmy