Containsi Graphql not working with not Latin letters

I’m getting the given data without regard to uppercase or lowercase letters using containsi .
This works with latin letters. But if I try to use non-Latin letters, then containsi doesn’t work - only exact matches are selected.

example query get1{
acdcexts(filters: {name: { containsi:“И”} }) {
data {
attributes { article name }

Is there a solution to this problem?

any update? it’s still not working…