From the Knowledge Base

Caching on WP.com with Page Optimizer

Caching on WP.com uses the Page Optimize caching tool and requires a different configuration than other 3rd party caching plugin. You must add the plugin's data-handle attribute value into the exclusions. This must be done for both the JS files

Setting up fake worker failed Error on update

This error comes up if there is a caching and/or minifying plugin on the site that has cached the previous version of the plugin scripts and now does not match with the updated plugin. To rectify this error, you need

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