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Your second code solved the promblem. Thank you!
P.S. Is it permanent or temporary solution?
Cyrillic doesn’t mean the word “Cyrillic”. It’s a type of alphabet as Latin, Arabic, etc. The example of the text in cyrillic: “Если названия категорий написаны кириллицей, фильтр не работает, категории не выводятся”.
Thank you! Now both plugins work correctly.
And please one more question: can I order filter categories alphabetically (form A to Z)? As I can understand, now they are ordered by the order of appearance in the pictures. TIA.