String translation custom_logo not working

I added this to wp-contet/polylang/wpml-config.xml:

<wpml-config>
  <admin-texts>
    <key name='theme_mods_apollon_child'>
      <key name='custom_logo' />
    </key>
  </admin-texts>
</wpml-config>

I got the field custom_logo in Strings Translations.
However logo does not change. Any ideas?
I am using Storefront theme from Woocommerce.

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