Package reference on net framework doesn't load transitive dependencies (not copied in output)

From scratch :

1. Create a class library A in net framework 4.7.2
2. Reference a nuget package, ex : Newtonsoft
3. Migrate class library A to Package Reference mode
4. Generate nuget package for class library A
5. Create a console application B in net framework 4.7.2
6. Reference class library A
7. Migrate console application B to Package Reference mode

My issue is that Newtonsoft is not copied in output of console application B, so :

If I use a function of A in B which has newtonsoft object in signature : error of compilation => need to reference Newtonsoft in console application B

If I use a function of A in B which use newtonsoft object in its body : error on runtime => FileNotFoundException