The category prefix doesn't work
WooCommerce Protected Categories has a Prefix option which adds "Protected:" before the name of each protected category.
If you have enabled the prefix but it isn't showing then this could be because you are displaying the categories using the 'Product categories' Gutenberg block.
Unfortunately, it is not possible to display the prefix in the categories block because the block editor doesn't provide a hook to enable us to do this. We will add support for this if the necessary hook becomes available in the future.
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