CCC (Concatenate, Combine and Cache) is a built-in PrestaShop functionality that allows you to reduce the number of requests of your template and then cache them.
Sometimes this functionality can interfere with our Data Sync process and block it.
If you are experiencing Data Sync errors, please open your PrestaShop backend and visit the section called
Advanced Parameters --> Performance
then get to the section called
CCC (Combine, Compress and Cache)
deactivate all its sub functionalities, then save, empty the PrestaShop cache and enjoy!
P.S: you can achieve the same level of data compression - and so loading page performances - using a CDN or a dedicated PrestaShop module that enforces the same compression and combination of libraries.