Hi, iliil, thank you
Yes, the field "alias_ru" is stored in the #__cck_store_item_content in the column "alias_ru"
No, I have not aliases generator, only manualy.
Yes, for the Russian language URL parameter set as "ru" in my language manager.
If I set NO in Multilanguage Aliases - all OK. Lists on any languages displayed (RU. EN, LV)
If I set All language/All language except default in Multilanguage Aliases - list on Russian no displayed (404), as well and list on Latvian (alias_lv). Only English.
Only new Joomla (3.9.22) + Seblod (3.19.0), template - protostar.
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What is it "..in the proper format" for alias_ru ? Columns "alias_ru", "alias_lv" has the same parameters as "alias_en" (varchar 400 and so on)