user reports of eth_getBlockByNumber returning null between block 19700053 and 19700454

[taratorio]

User nicolaslaw.eth reported this on Discord (msg). Needs investigation.

System information

Erigon version: v2.60.0

OS & Version: Linux

Erigon Command (with flags/config): ${ERIGON_FLAGS-} --private.api.addr=0.0.0.0:9090 --sentry.api.addr=sentry:9091 --downloader.api.addr=downloader:9093 --txpool.disable --metrics --metrics.addr=0.0.0.0 --metrics.port=6060 --pprof --pprof.addr=0.0.0.0 --pprof.port=6061 --authrpc.jwtsecret=/home/erigon/.local/share/erigon/jwt.hex --authrpc.addr=0.0.0.0 --datadir=/home/erigon/.local/share/erigon --chain=mainnet --http --ws --http.api=eth,debug,net,trace,web3,erigon --db.size.limit=8TB

Consensus Layer: Nimbus

Consensus Layer Command (with flags/config): ``` command: >- --network=mainnet --data-dir=/home/user/nimbus-eth2/build/data/shared_mainnet_0 --web3-url=ws://erigon-erigon-1:8551 --el=ws://erigon-erigon-1:8551 --jwt-secret=/jwt/jwt.hex --nat=extip:130.254.84.224 --log-level=info --tcp-port=9000 --udp-port=9000 --rest --rest-address=0.0.0.0 --rest-port=5052 --metrics --metrics-address=0.0.0.0 --metrics-port=8008

Chain/Network: Ethereum mainnet

#### Expected behaviour
eth_getBlockByNumber to return block data matching what other clients are returning, e.g. can try quicknode api

curl https://docs-demo.quiknode.pro/ \ -X POST \ -H "Content-Type: application/json" \ --data '{"method":"eth_getBlockByNumber","params":["0x12C9955",false],"id":1,"jsonrpc":"2.0"}'

#### Actual behaviour
returns null

#### Steps to reproduce the behaviour

curl \ -X POST \ -H "Content-Type: application/json" \ --data '{"method":"eth_getBlockByNumber","params":["0x12C9955",false],"id":1,"jsonrpc":"2.0"}'

#### Backtrace
N/A

[Giulio2002]

Closed by #10850