Telemetry PROCESSOR seems to be called twice per packet

I have a PROCESSOR attached to a telemetry packet. On receipt of the packet, the PROCESSOR sends a command back to the instrument. However, instead of a single command sent, the PROCESSOR sends two, a few milliseconds apart. Here are two commands from the log (CmdTlmServer):

2022-08-23 13:58:55.198     
INFO    DEFAULT__DECOM__LVX cmd("LVX TIME_RESPONSE with RCV_TIME 16622667336477032704, XMT_TIME 16622667336477032704")
2022-08-23 13:58:55.174     
INFO    DEFAULT__INTERFACE__LVX_INT cmd("LVX TIME_RESPONSE with RCV_TIME 16622667336363126422, XMT_TIME 16622667336363126422")

It's as if the PROCESSOR is called twice. Is this a COSMOS bug, or am I doing something silly?

Here is the telemetry packet and PROCESSOR:

TELEMETRY LVX TIME_REQUEST BIG_ENDIAN "Time request"
  <%= render "_ccsds_tlm.txt", locals: {id: 0x00} %>
  <%= render "_timetag_tlm.txt" %>
  # Keyword      Name           BitSize Type   ID      Description
  APPEND_ITEM    CRC            16      UINT           "CRC"
    FORMAT_STRING "0x%04x"
  PROCESSOR TIMEREQRESP time_service.rb

Here is time_service.rb (some comments deleted):

require 'cosmos/processors/processor'
require 'cosmos/api/api'

module Cosmos
  class TimeService < Processor
    include Api

    # NTP uses 1900 as the epoch
    NTP_DELTA = Time.utc(1970) - Time.utc(1900)

    def initialize
      super()
    end

    # Perform processing on the packet.
    def call(packet, buffer)
      ntp = Time.now + NTP_DELTA    # seconds since the epoch
      ntp_i = ntp.to_i          # broken into integer
      ntp_f = ntp.nsec*(2**32)/(10**9)  #   and fraction
      ntp_time = (2**32)*ntp_i + ntp_f  # combined into 64-bit value
      cmd("LVX TIME_RESPONSE with RCV_TIME #{ntp_time}, XMT_TIME #{ntp_time}")
    end

  end

I am using COSMOS 5.0.3 Linux.

OpenC3 / cosmos

Telemetry PROCESSOR seems to be called twice per packet #95