[v1] VSC can not find function with Cyrillic symbols in name

[v-chernys-en-co]

For troubleshooting assistance, refer to the troubleshooting guide

Description

VSC can not find function with Cyrillic symbols in name. File format UTF8 with BOM.
Pressing F12 on function name makes tooltip "Function ... not found".

Reproduction steps

Steps to reproduce the behavior:

create two functions:
ОтправитьАльт0(seq = "tln") ; SendAlt0 function
{
SendInput {Alt Down}
sendinput {Raw}%seq%
SendInput {Alt Up}
return
}
SendAlt(seq = "tln")
{
ОтправитьАльт0(seq) ; call to SendAlt0 function
return
}

Expected behavior

In VSC select 'ОтправитьАльт0' function name (line 10).
Press F12.
Expect to "Go to definition", i.e. to line 1.