When i make changes in the header-extensions.php and then copy these into childtheme, the changes dont appear on the site. It only works when changing it in org.theme but that doesnt help much, cause childtheme is required for updates and multisite. Any suggestions what to do?
It should overwrite and have to work. Can you please send us the child theme file via email here. So that we will check it on our end and let you know the result.
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