Autoformat using ClangFormat is not working consistently if there is issues in .clang-format file (such as double entry of some variable)

I enabled "Format while typing" and have my .clang-format file. In older version of QtCreator it was following .clang-format while typing or indenting. Since some version of QtCreator it started to falling back to Qt built-in style while typing and follows .clang-format only if I explicitly use "Format At Cursor" by ClangFormat.

After some research I found out that my .clang-format contained some entry twice, which makes it "problematic" I suppose.

In the current version there are two scenarios, which can be seen in the attached videorecording:

1) .clang-format is correct (no double entry) and typing semicolon inside "else { }" automatically formats by .clang-format rules:

if (true) {
    ;
}
else {
    ;
} 

2) .clang-format has double entry of "AllowShortFunctionsOnASingleLine" and typing semicolon inside "else { }" falls back to Qt built-in rules:

if (true) {
    ;
} else {
    ;
} 

However, if I select that lines and use "Format At Cursor" by ClangFormat it formats correctly as in 1).

I expect that it should not fallback silently to default style, but rather inform user that .clang-format has problems or continue to use .clang-format as in the old versions of QtCreator.