COM interoperable DLL's written with .NET Core 10

We are using DLL's with COM interoperability in our Uniface application. Up to today we use C# / .NET Framework 4.8, but want to switch over to C# / .NET Core to be more in line with all other written applications written in C#. I managed to create a (relative) simple DLL with .NET Core, publish it and create a Type Library. I can import that TLB file into Uniface 10 and compile the signature. But when instantiating this component I get an error stating “Unable to get COM type information for COM class”. What could be wrong?