- Plesk Onyx
staging.example.com is a cloned WordPress instance from example.com.
Any change made in configuration or content of staging.example.com (for example via WordPress Admin > Posts) automatically affects the original site.
There is a caching plugin like Memcachy installed on example.com.
- #EXTWPTOOLK-1773 "Cloned WordPress installations should no longer share their cache with the source installation (we know sharing is caring, but not this time)."
- WordPress Toolkit 3.6.0 21 February 2019
If update is not possible for some reason you may try the following
Until a fix becomes available, disable caching plugin. There are multiple ways of doing it, for example via WordPress admin dashboard.
Below is resolution via renaming the plugin file for memcachy plugin only:
Log into Plesk.
object-cache-memcached.phpfiles in Domains > example.com > File Manager > httpdocs > wp-content to