I am using the OceanWP theme and customized it with the WordPress Customizer feature. Then, I created a child theme based on OceanWP, because I introducted some new shortcodes and did not want to alter the base theme. Unfortunately, when I switch themes, all my customization is lost.

I know that the customization is stored in the WordPress options table. I found theme_mods_ocean and copied the content to theme_mods_myChildTheme. I can store the changes, but as soon as I reload the blog, the database entry is reverted to its initial value.

How is this possible? Is there any other place where the customization is saved and restored from? I do not want to re-configure the entire child theme, if possible.