[exim] EXIM 4.62 question about debug_print broken in transp…

I was expecting to see:

    >>>> debug: router: dnslookup
    >>>> debug: transport: verp_smtp

Instead this occurs:

    node1# exim -d -bt david-request@??? 2>&1 |\
           egrep "transport|debug"
    >>>> debug: router: dnslookup
    set transport verp_smtp
    queued for verp_smtp transport: local_part = david-request
      transport: verp_smtp
      router = dnslookup, transport = verp_smtp

The transport is set correctly and no debug_print occurs.
If I do an 'exim -bP transport verp_smtp' I see debug_print
is set correctly.

Someone let me know how to produce debug output from inside a
transport stanza.

Thanks.

Here's my configuration:

# router

dnslookup:
   driver    = dnslookup
   debug_print = ">>>> debug: router: dnslookup"
   domains   = ! +local_domains
   transport = \
      ${if match {$local_part}{^(.+)-request\$}\
      {verp_smtp}{remote_smtp}}
   ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
   no_more

# transports

remote_smtp:
driver = smtp
debug_print = ">>>> debug: transport: remote_smtp"

verp_smtp:
driver = smtp
debug_print = ">>>> debug: transport: verp_smtp"




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