nRF52840 NFC tag stopped working

Hello.
We manufacture the device on nRF 52840 and use NFC tag emulation to connect to BLE. We produced two batches of printed circuit boards and there were no problems.
But on the last batch, NFC stopped working.
We did not make any changes to the firmware and printed circuit boards, but the NFC tag does not work in any of the boards from last batches.

Can you suggest where to look for the problem?

Here is what we use
SDK 15.3.0, t2t driver emulation, s140_nrf52_6.1.1_softdevice

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