Cyrillic field names are replaced by field ID (e.g., `_7`) when searching fields via `@` in the new editor

In the new editor, when searching for fields using the @ mention feature, if a field name is written in Cyrillic, it is displayed as _7 (i.e., the field number instead of the actual name).

As a temporary solution, we have to write the field name in both Russian and English, which results in excessively long field names.

There was a similar problem in the old editor.