Why is the DisclosedVendors segment excluded when isServiceSpecific=true in the EU TCF section?

[shantanu-kamdi]

I'm using the iabgpp-es to encode GPP strings that include the EU TCF v2 section (section ID 2).
I've observed that when isServiceSpecific is set to true the library omits the DisclosedVendors segment entirely from the encoded TC string, even if DisclosedVendors data is provided (e.g., via a bitfield or range encoding of vendor IDs that were disclosed in the CMP UI).

Sample code:
const gppCmpApi = new CmpApi(CMP_ID, CMP_VERSION);
gppCmpApi?.setSectionString(TcfEuV2.NAME, tcfString);
gppCmpApi?.setFieldValue(TcfEuV2.NAME, TcfEuV2Field.IS_SERVICE_SPECIFIC, false);

Sample strings:
TCF: CQcrdcAQcrdcAAKA9AENCKFsAP_AAEPAACRQL3wDwAdABcAGyAl8BooEVwKWgVmgtuC3cFvQW_guCC60F2AXZgu4C7sF3wXrgvaC94L2QEQAuADZAZ8A0WC3ALcwW7BbwC4AFwgLiwXHBciC5YLmQXWBdgC7UF3QXgAvIBeoC9gAAAAA.IL3wDQAdABcAGyAl8BooEVwKWgVmgtuC38FwQXWguwC7MF3AXdgu-C94.YAAAAAAAAAAA

GPP: DBABMA~CQcsnG_QcsnG_AKA9AENCKFsAP_AAEPAACRQL3wDwAdABcAGyAl8BooEVwKWgVmgtuC3cFvQW_guCC60F2AXZgu4C7sF3wXrgvaC94L2QEQAuADZAZ8A0WC3ALcwW7BbwC4AFwgLiwXHBciC5YLmQXWBdgC7UF3QXgAvIBeoC9gAAAAA.YAAAAAAAAAAA

Changing isServiceSpecific to false adds the vendors disclosed section
My Question is: For vendorsDisclosed, do we need to use isServiceSpecific as false? Or is this known issue?

[HeinzBaumann]

This is a result of the GPP libraries not being on par with the latest TCF spec. I have an A/I to fix this in the next few weeks. Thanks