PaceJet - Shipment Date not updated

Scenario:

SO Shipment is created with Shipment Date = 11/20/2023

Shipment is Confirmed in Acumatica on 11/20/2023 so that PaceJet can process it (I don’t like the fact that PaceJet requires  Confirmation in order to process shipment, but that’s another topic).

Warehouse cannot prepare the shipment until 11/29/2023

Shipment is processed in PaceJet on 11/29/2023

PaceJet pushes tracking data and attachments to Acumatica on 11/29/2023.

PaceJet provided log showing that the integration sent new Shipment Date as 11/29/2023, but the Shipment Date remained as 11/20/2023 in the Acumatica shipment.

Since the client is creating Invoices based on Shipment Date, they want to update the Shipment Date to the date when it was processed in PaceJet.

PaceJet support says that this is an Acumatica issue.

Do you have experience with the PaceJet integration that can help clarifying what the issue is in this case?

Thanks