Downloaded blockchain using Bitcoin-qt with unpurned mode, but bitcoind told me it’s purned

I synced the blockchain in unpurned mode (it is 299 GB currently) when first open bitcoin core via bitcoin-qt. And I can run console scripts in bitcoin-qt ‘s debug window normally. But when I open the bitcoind, it shows me this 2019-12-20T11:53:41Z Bitcoin Core version v0.19.0.1 (release build) 2019-12-20T11:53:41Z Assuming ancestors of block 00000000000000000005f8920febd39 25f8272a6a71237563d78c2edfdd09ddf…

Details