How to Achieve Dual WinUSB Vender Class

I'm trying to achieve a dual vender class in a single device and successes, one's interface is 3 and the other is 4, and dual are recognized by PC. One interface string is "**ZPLINK CMSIS-DAP**", and the other is "**ZPLINK-WL CMSIS-DAP**"(See Picture)

And I did some test, both of them can be accessed by there IN or OUT endpoints.

But when I use Keil or IAR, they only can recognize one WinUSB device and only access the last interface's **ZPLINK-WL CMSIS-DAP,** which interface is 4. After I deleted the interface 4, then Keil can recognize interface 3's **ZPLINK CMSIS-DAP**.

Is Keil or IAR can only access one WinUSB in a single device at once? Always choose the last one?

No source file, test, or entry point is named. Start by reproducing the dual-interface device with interfaces 3 and 4, then compare how Keil and IAR recognize and access the two WinUSB interfaces; done means establishing and documenting the expected behavior or a confirmed project change.

Written by the indexing model from the issue text.