Compressed CSS and JS are cached in browsers for 4 hours. This is a problem when we want the scripts to be updated without changing the file name (basically without code release as the compressed file names are based on the libraries loaded on the page and content inside it so even if we clear caches the filenames usually don't change).
Drupal CORE by defaults adds a query string (State variable system.css_js_query_string) which is changed after every drush cr to fix cache problem but it doesn't add this query string for compressed version.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
If I understand correctly, this shouldn't be needed if you CSS/JS library definitions are using the "version" property correctly, right? If a library has changed, you should do a code deploy where the library has the version changed. Or, just exclude version and Drupal will hash the contents of the file to create a fake version to use.