What is the correlation between color profiles and anti-aliasing gaps when shapes overlap?

[msusss]

 

This problem gave me a headache, but it seems that the problem usually appears in CMYK documents, and the problem seems to be almost solved just by assigning or converting the color profile to another CMYK profile.

Since the problem does not occur even after returning to the original profile, it seems that the problem is not caused by a specific profile, but is related to the profile replacement action.

[NotMyFault]

Changing color profiles will change all colors, especially black 100%K could be converted to rich black (a mixture of all colors and 75%K).
the light halo at the letter R seems a product of pure black on coated papers. 
After converting to uncoated and back to coated, the black color is different.

If you manually adjust the black, you get the same effect without color profile changes.