BSC Geth 1.6.6 fails to start after PBSS snapshot extraction: requires --datadir.ancient

[zixxtech]

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@KevinShen1124

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               Issue Description 

System information

Geth version: 1.6.6 OS & Version: Linux Arguments:

Description

• Steps to reproduce the behaviour
  Download snapshot
  bash fetch-snapshot.sh -d -c -p -D /opt/bsc/downloads/mainnet-geth-pbss-20260202 mainnet-geth-pbss-20260202
  Unzip snapshot
  bash fetch-snapshot.sh -e -D /opt/bsc/downloads/mainnet-geth-pbss-20260202 -E /opt/bsc/node mainnet-geth-pbss-20260202-pruneancient.csv
  Startup command
  ~/geth --tries-verify-mode none --config /opt/bsc/config.toml --datadir /opt/bsc/node/server/data-seed --cache 8000 --rpc.allow-unprotected-txs --history.transactions 0

I've already tried starting it with --datadir.ancient, but the same problem persists.

• Expected behaviour
  Node starts successfully using the PBSS snapshot without errors.
• Actual behaviour
  1.During extraction of the 2026-02-02 snapshot, an error appears near the end indicating a mismatch between the required decompression version and the actual files.
  2.When starting the node, geth exits with: Fatal: Failed to register the Ethereum service: ancient chain segments already extracted, please set --datadir.ancient to the correct path

Backtrace

[backtrace]
~/geth --tries-verify-mode none --config /opt/bsc/config.toml --datadir /opt/bsc/node/server/data-seed --cache 8000 --rpc.allow-unprotected-txs --history.transactions 0
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  DelayLeftOver=25ms
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  MaxWaitProposalInSecs=45
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  Recommit=10s
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  Mev.Enabled=false
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  Mev.BuilderFeeCeil=0
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  Mev.GreedyMergeTx=true
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  Mev.ValidatorCommission=100
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  Mev.BidSimulationLeftOver=30ms
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  Mev.NoInterruptLeftOver=235ms
INFO [02-11|17:04:02.760] ApplyDefaultMinerConfig                  Mev.MaxBidsPerBuilder=2
INFO [02-11|17:04:02.762] Maximum peer count                       ETH=1350 total=1350
INFO [02-11|17:04:02.763] Smartcard socket not found, disabling    err="stat /run/pcscd/pcscd.comm: no such file or directory"
Chain metadata
  databaseVersion: 9 (0x9)
  headBlockHash: 0xef72d758c18920eff6ca7f85f874b7d9b990198b315a198d8bfc8005d79ebcb3
  headFastBlockHash: 0xef72d758c18920eff6ca7f85f874b7d9b990198b315a198d8bfc8005d79ebcb3
  headHeaderHash: 0xef72d758c18920eff6ca7f85f874b7d9b990198b315a198d8bfc8005d79ebcb3
  lastPivotNumber: 6920578 (0x699982)
  len(snapshotSyncStatus): 0 bytes
  snapshotDisabled: false
  snapshotJournal: 13721860 bytes
  snapshotRecoveryNumber: 47342098 (0x2d26212)
  snapshotRoot: 0xaa1acbcd6885d5acaea11ece605dd94ad0dceeca71a07b0180dcfa6e2e410fc4
  txIndexTail: 0 (0x0)

Fatal: Failed to register the Ethereum service: ancient chain segments already extracted, please set --datadir.ancient to the correct path

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