Overloading function template with base class parameter is not selected

If you look at Best Viable function, you might see:

1. there is at least one argument of F1 whose implicit conversion is better than the corresponding implicit conversion for that argument of F2

And in Rankingofimplicitconversionsequences:

Each type of standard conversion sequence is assigned one of three ranks:

1. Exact match: no conversion required, lvalue-to-rvalue conversion, qualification conversion, function pointer conversion,(since C++17) user-defined conversion of class type to the same class
2. Promotion: integral promotion, floating-point promotion
3. Conversion: integral conversion, floating-point conversion, floating-integral conversion, pointer conversion, pointer-to-member conversion, boolean conversion, user-defined conversion of a derived class to its base

Here, template void func(const T& ) has rank "exact match" (qualification conversion),
whereas template void func(const BaseT& ) has rank "conversion" ( derived class to its base).

Template being more specialized appears later in case of previous "tie" (#5 in Best Viable function). And it happens with extra template void func(const DerivedT&).