Why Erigon deleted all data until 20000000 block?

Erigon version: erigon version 2.59.3-088fd8ef Chain/Network: mainnet OS & Version: Ubuntu 20.04.6 LTS, CPU E5-2695 v4, 36 cores, 192 Gb RAM Disk: NVMe HPE MT006400KWHAE 6.4 Tb

Some months ago I used --internalcl in erigon command: ExecStart=/home/root/erigon/build/bin/erigon --internalcl --datadir=/disk_sde/erigon --ws --http.api=eth,erigon,engine,web3,net,debug,trace,txpool --authrpc.jwtsecret=/home/root/erigon/jwtsecret --prune.h.before=13916166 --prune.r.before=13916166 --prune.t.before=13916166 --prune.c.before=13916166 --torrent.download.rate=128mb --rpc.batch.limit=5000

Then I changed to lighthouse: ExecStart=/home/root/erigon/build/bin/erigon --datadir=/disk_sde/erigon --ws --http.api=eth,erigon,engine,web3,net,debug,trace,txpool --authrpc.jwtsecret=/home/root/erigon/jwtsecret --prune.h.before=13916166 --prune.r.before=13916166 --prune.t.before=13916166 --prune.c.before=13916166 --torrent.download.rate=128mb --rpc.batch.limit=5000

Lighthouse command:

ExecStart=/usr/bin/lighthouse bn \
  --network mainnet \
  --port 9100 \
  --datadir /disk_sde/lighthouse \
  --http \
  --execution-endpoint http://127.0.0.1:8551 \
  --execution-jwt /home/root/erigon/jwtsecret \
  --disable-deposit-contract-sync \
  --checkpoint-sync-url https://mainnet.checkpoint.sigp.io

Problem: I am indexing ethereum blockchain to my database and blocks before 20000000 are indexed. Now, I need to do some requests again and noticed that I can not get data before 19999999 block (159 days ago), but starting from 20000000 I can. Why is this and how to fix? Some months ago I used Caplin, but now Lighthouse, don't know if it's important.

Example:

testnet = 'http://127.0.0.1:8545'

_block_number = 19928858 # 169 days ago
block = requests.post(testnet, json={"method":"eth_getBlockByNumber","params":[hex(_block_number),True],"id":1,"jsonrpc":"2.0"}, headers={"Content-Type": "application/json"}).json()
print(block)

# 19985875 block 161 days ago
_hash = '0xd18269cdb834bff00e6d3331f8f699f4ff05f514bcba739ab0e55b4625c89335'
tx = requests.post(testnet, json={"method":"eth_getTransactionByHash","params":[_hash],"id":2,"jsonrpc":"2.0"}, headers={"Content-Type": "application/json"}).json()
print(tx)

_block_number = 19999999 # 159 days ago
block = requests.post(testnet, json={"method":"eth_getBlockByNumber","params":[hex(_block_number),True],"id":3,"jsonrpc":"2.0"}, headers={"Content-Type": "application/json"}).json()
print(block)

_block_number = 20000000 # 159 days ago
block = requests.post(testnet, json={"method":"eth_getBlockByNumber","params":[hex(_block_number),True],"id":4,"jsonrpc":"2.0"}, headers={"Content-Type": "application/json"}).json()
print(block)

Result:

{'jsonrpc': '2.0', 'id': 1, 'result': None}
{'jsonrpc': '2.0', 'id': 2, 'result': None}
{'jsonrpc': '2.0', 'id': 3, 'result': None}
{'jsonrpc': '2.0', 'id': 4, 'result': {'baseFeePerGas': '0x12643ff14', 'blobGasUsed': '0x20000', 'difficulty': '0x0', 'excessBlobGas': '0x0', 'extraData': '0x6265617665726275696c642e6f7267', 'gasLimit': '0x1c9c380', 'gasUsed': '0xa9371c', 'hash': '0xd24fd73f794058a3807db926d8898c6481e902b7edb91ce0d479d6760f276183', 'logsBloom' ...

In journal I see a lot of:

nov 09 04:45:56 sirjay-pc erigon[1200629]: [WARN] [11-09|04:45:55.841] [rpc] served                             conn=127.0.0.1:46094 method=eth_call reqid=100 t=296.33µs err="execution reverted"
nov 09 04:45:56 sirjay-pc erigon[1200629]: [WARN] [11-09|04:45:56.266] [rpc] served                             conn=127.0.0.1:46272 method=eth_call reqid=259 t=270.885µs err="execution reverted"
nov 09 04:45:56 sirjay-pc erigon[1200629]: [WARN] [11-09|04:45:56.272] [rpc] served                             conn=127.0.0.1:46272 method=eth_call reqid=262 t=261.498µs err="execution reverted"
nov 09 04:45:56 sirjay-pc erigon[1200629]: [WARN] [11-09|04:45:56.278] [rpc] served                             conn=127.0.0.1:46272 method=eth_call reqid=265 t=225.8µs err="execution reverted"
nov 09 04:45:56 sirjay-pc erigon[1200629]: [WARN] [11-09|04:45:56.296] [rpc] served                             conn=127.0.0.1:46272 method=eth_call reqid=268 t=267.124µs err="execution reverted"
nov 09 04:45:56 sirjay-pc erigon[1200629]: [WARN] [11-09|04:45:56.302] [rpc] served                             conn=127.0.0.1:46272 method=eth_call reqid=271 t=286.938µs err="execution reverted"

erigontech / erigon

Why Erigon deleted all data until 20000000 block? #12689