Nested scopes regression in clang-format 13.0.0, worked in clang-format 12.0.1

[JohnC32]

Nested scopes do not work in 13.0.0. Below we use scopes to increase indentation to group like items, a common pattern in writing checks. Here I've simplified things a bit.

Using clang-format 12.0.1, on testcheck.cpp we have:

int foo() {
    // first check
    {
        int a = 1;
        CHECK(a == 1);
    }

    // extra scope to group common types of checks
    {
        {
            char a = 'a';
            CHECK(a == 'a');
        }

        {
            char b = 'b';
            CHECK(b == 'b');
        }
    }

    // other checks
    {
        bool b = false;
        CHECK(b == false);
    }
}

If I then run clang-format 13.0.0 on testcheck.cpp we get:

// clang-format 13.0.0 result
int foo() {
    // first check
    {
        int a = 1;
        CHECK(a == 1);
    }

    // extra scope to group common types of checks
    {{char a = 'a';
    CHECK(a == 'a');
}

{
    char b = 'b';
    CHECK(b == 'b');
}
}

// other checks
{
    bool b = false;
    CHECK(b == false);
}
}

Here's the _clang-format used in the above.

---
BasedOnStyle: Google
IndentWidth: 4
...

Note, if one puts statements in the extra scope, then clang-format 13 is okay. For example, if we add an unused variable, clang-format 13 is good:

    // extra scope to group common types of checks
    {
        int makeClangFormat13Happy;
        {

This maybe related to issue #42582, but for my case all is good with clang-format 12.0.1 and we have issues with 13.0.0. Since this is a regression, I thought it may help to create a separate issue.