Why does the Premmerce Product Filter for WooCommerce plugin not show filtering by attributes?

Question

WordPress

Initially, all filters were configured. Filtering was by attributes: color, manufacturer, composition. At some point, she disappeared. Shows only the filter by price and category. And not all categories are on the list. Plugin settings are the same, visibility of all attributes and categories is enabled. Also, in the product settings, all previously configured attributes disappeared.

Answer 1

Also, in the product settings, all previously configured attributes disappeared.

This answers your main question. Therefore the filter also does not show.
But why this happened, it is already necessary to look.