Hello Jiaxin:

Edk2 older branch removed the "class\subclass" in all VFR in the Network Stack modules. (IP4, IP6 and ISCSI) Refer below commit.

https://github.com/tianocore/edk2/commit/b965bd99c533b24bec56647a8c9b1fa2c2ed8bd8#diff-3d9f695b702160a70a74145d12121272

But when we upload the Initial IP4Dxe the changes are reverted. But IP6Config and ISCSI modules are not having those.

https://github.com/tianocore/edk2/commit/1f6729ffe98095107ce82e67a4a0209674601a90#diff-6788a5f6871902342bd0ea72eb123df4

Do we have any specific reason behind that.

-Siva