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Since a more recent update in the past month or two, I am getting the following warning in debug.log and when using Query Monitor.
I disabled all plugins except for WooCommerce and switched to the Storefront base theme to test this and it still occurs.
The error/warning says: "Function register_taxonomy was called incorrectly. Taxonomy names must be between 1 and 32 characters in length."
Caller: register_taxonomy()
Plugin: woocommerce
register_taxonomy()
wp-includes/taxonomy.php:510
WC_Post_Types::register_taxonomies()
wp-content/plugins/woocommerce/includes/class-wc-post-types.php:277
do_action('init')
wp-includes/plugin.php:517