Separately started downloader stuck with 0 files to go

[awskii]

[INFO] [03-09|19:06:29.523] [snapshots] Downloading                  progress="(0/0 files) 0.00% - 0B/0B" time-left=999hrs:99m total-time=2562047h47m16.854775807s download-rate=0B/s completion-rate=0B/s alloc=19.3MB sys=48.8MB
[INFO] [03-09|19:06:49.522] [snapshots] Downloading complete         time=2562047h47m16.854775807s

1. (misc) total-time is a time.Since(d.startTime) but d.startTime is set only on grpc Add call.
2. user reports that sanps/preverified.toml appeared on fs but probably been ignored.
3. killing separate downloader and starting erigon by itself resolves the issue but we allow running erigon --no-downloader along with separate downloader instance and it expected to work smoothly.

User configuration is to be added.

[tsutsu]

Broken config:

/opt/erigon/releases/latest-%i/bin/erigon \
  --datadir=/scratch/node/%i/el \
  --nat=extip:${IP_ADDRESS} \
  --private.api.addr=127.0.0.1:${PRIVATE_API_PORT} \
  --authrpc.addr=localhost \
  --authrpc.port=${ENGINE_PORT} \
  --externalcl=false \
  --downloader.api.addr=127.0.0.1:${DOWNLOADER_API_PORT} \
  --caplin.blobs-immediate-backfill=true \
  --caplin.discovery.port=${CL_LIBP2P_UDP_PORT} \
  --caplin.discovery.tcpport=${CL_LIBP2P_TCP_PORT} \
  --diagnostics.endpoint.port=${DIAG_PORT} \
  --db.pagesize=8KB \
  --db.size.limit=${DB_SIZE_LIMIT} \
  --chain=${CHAIN_NAME} \
  --db.read.concurrency=8192 \
  --rpc.batch.concurrency=100 \
  --port=${ETHP2P_PORT} \
  --p2p.allowed-ports=${ETHP2P_PORTS} \
  --log.console.verbosity=info \
  --http.addr=localhost \
  --http.port=${HTTP_PORT} \
  --http.api=debug,eth,net,web3,erigon \
  --http.vhosts=* \
  --ws=true

/opt/erigon/releases/latest-%i/bin/downloader \
  --datadir=/scratch/node/%i/el \
  --chain=${CHAIN_NAME} \
  --downloader.api.addr=127.0.0.1:${DOWNLOADER_API_PORT} \
  --nat=extip:${IP_ADDRESS} \
  --torrent.port=${TORRENT_PORT} \
  --torrent.download.rate=400mb \
  --torrent.download.slots=10

[VBulikov]

VBulikov added Imp2 as Importance