Filters the value of a specific default network option.
Description
The dynamic portion of the hook name, $option, refers to the option name.
Parameters
$default_valuemixed- The value to return if the site option does not exist in the database.
$optionstring- Option name.
$network_idint- ID of the network.
Source
return apply_filters( "default_site_option_{$option}", $default_value, $option, $network_id );
Using this filter will prevent you from creating or updating an option. This is likely a bug on WordPress.
If you want to be able to save your option but still want to use the default for when it doesn’t exist yet, then you must remove the filter before updating the option.