On Bedrock, the sculk patches don't replace the polished deepslate in the ancient city during world gen, which isn't the case on Java.
How to Reproduce
1. Find an ancient city.
2. Locate any structure that contains polished deepslate.
3. Take a look at it if the polished deepslate turned into sculk or not.
The polished deepslate doesn't get replaced by sculk and instead it is only being covered in sculk vein.
The polished deepslate has a chance to be replaced by sculk patches.