IsPattern breaking inside of IfStatement

[belav]

This if statement breaks in a rather weird way.

        if (
            Nullable.GetUnderlyingType111111111111111(
                typeof(T)
            ) is Type innerType &&
            innerType.IsEnum
        ) {
            return;
        }

[belav]

This also is breaking weird now.
This was a result of #152 but is working now

// used to break like this
                if (
                    oldValueType != newValueType // Definitely different
                    || !IsKnownImmutableType(oldValueType) // Maybe different
                    || !oldValue.Equals(newValue)
                ) // Somebody says they are different
                 {
                     return true;
                 }
// now breaks like
                if (
                    oldValueType !=
                    newValueType // Definitely different
                    ||
                    !IsKnownImmutableType(
                        oldValueType
                    ) // Maybe different
                    ||
                    !oldValue.Equals(newValue)
                ) // Somebody says they are different
                {
                    return true;
                }