I'm not sure whether the method1 from A should be mentioned as a member function or as an inherited member, currently both mentions are present.

The fact that the parameter is missing in the detailed description is, as far as I can see, the result from the fact that the scope of using is not taken into account in the (function MemberDefImpl::writeDocumentation in file memberdef.cpp:

      const Definition *scope = cd;
      if (scope==0) scope = nd;
      hasParameterList=writeDefArgumentList(ol,scope,this);

for both method1 the scope->name() is here B from the class cd but for the method1 from class A the actual scope is probably A and is for that reason probably not matched.

@doxygen how to handle?

In the example the using A::method1 doesn't do anything it seems. Clients of class B can already invoke B::method1 without the using statement, because the method is inherited from A. I can imagine this can be useful in case the method in class A is protected, and in class B one wants to expose it as a public method without adding a forwarding wrapper method. I think in this case, doxygen should show the method as a public method of class B. So what needs to be fixed is show the parameter list, as is requested.

Look like a copy'n'paste mistake where the template argument list was assigned instead of the method's argument list 🙄.
Please verify if the attached commit fixes the problem.

From my tests it looks like the problem has been solved.

I installed the master version to try if it was solved. But I get the following. The "Member function Documentation" is missing:

Indeed I see this is a new behaviour. The "Member function Documentation" is generated only if the help of the function contains more than just a "\brief" (or equivalent) . With the following code:

// \class A
/// Class A
class A {
public:
   /// method 1 in A
   void method1(int i){}
};


/// \class B
/// Class B
class B : public A {
public:
   using A::method1;
   /// method 1 in B.
   /// The is more help for method 1 in B.
   void method1(int i){}
   /// method 2 in B.
   /// The is more help for method 2 in B.
   void method2(int i){}
};

I get:

Which is now correct. We can see the correct parameters' list.
Thanks for fixing it.

@couet Alternatively, you can enable ALWAYS_DETAILED_SEC in the configuration file.

This issue was previously marked 'fixed but not released',
which means it should be fixed in doxygen version 1.9.2.
Please verify if this is indeed the case. Reopen the
issue if you think it is not fixed and please include any additional information
that you think can be relevant (preferably in the form of a self-contained example).