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Problem:
The client reported that a new brand attribute "ARS/SOLL" was not appearing in the "Filter by Attribute" section in the catalog in the second language after import.
Solution:
We found that the ARS/SOLL term in Russian had no products assigned because products and taxonomies were set as 'Appear as translated' and only the Brand term was translated, not the products. We recommended using the 'duplicate' feature instead of the 'fallback' option. Documentation on duplicating content
We duplicated one product of the Brand 'ARS/SOLL' to Russian and turned off the option "Use the product attributes lookup table for catalog filtering" in WooCommerce -> Settings -> Products -> Advanced. This should allow the filter widget to show the brand in the Russian shop after duplicating/translating the corresponding products.

If this solution does not seem relevant to your situation, please open a new support ticket with us.