Explorer nodes in shard 0 and shard 1

gistfile1.txt

=======================
shard 1 explorer node:

dennis.won@Jongs-MacBook-Pro:~/harmony-one/harmony (pr_staking_txn_history_t3) $ curl --location --request POST 'http://127.0.0.1:9599' --header 'Content-Type: application/json' --data-raw '{
    "jsonrpc": "2.0",
    "method": "hmyv2_getTransactionsHistory",
    "params": [{ "address": "one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7", "fullTx": true, "txType": "ALL", "order": "ASC" }],
    "id": 1
}'
{"jsonrpc":"2.0","id":1,"result":{"transactions":[{"blockHash":"0xe30e9b3aea9f37ef5498a47ca159ce881495a32091a86e5fa914b8a94ec88311","blockNumber":56,"from":"one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7","timestamp":1583270509,"gas":21000,"gasPrice":1000000000,"hash":"0x116e9f2563274ed4d738fd991eb10ee03a4119c7e0a6366f38e8a3f298f860a7","input":"0x","nonce":0,"to":"one129r9pj3sk0re76f7zs3qz92rggmdgjhtwge62k","transactionIndex":0,"value":10000000000000000000,"shardID":0,"toShardID":0,"v":"0x28","r":"0x7bf59745ec4c7a786bedf5f6c908907aec738170debaeca64c6348f7f1b4af4b","s":"0x32976cdf4176cac714825ffd2bafe07720048cd0b5ce1d11284507c56d230ad0"},{"blockHash":"0xb44f8ad3a66365a582c39ee99b8a057a365acab7ee843f749150878a642db634","blockNumber":62,"from":"one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7","timestamp":1583270557,"gas":21000,"gasPrice":1000000000,"hash":"0xb6d7f3c80edc4593078edbc8b76069c226602990d1ea8c4be8ca6c86f49fc58a","input":"0x","nonce":1,"to":"one129r9pj3sk0re76f7zs3qz92rggmdgjhtwge62k","transactionIndex":0,"value":10000000000000000000,"shardID":0,"toShardID":0,"v":"0x27","r":"0x5f767ce4879e362a6cf485b34aa1c4fb8ad9ce380817fc8dac23a57cb54b7dd0","s":"0x27a02567c6ca28596ad488c4e11d71fce0d4d35a616f5bac82d20e8f269eb910"}]}}

=======================
shard 0 explorer node:

dennis.won@Jongs-MacBook-Pro:~/harmony-one/harmony (pr_staking_txn_history_t3) $ curl --location --request POST 'http://127.0.0.1:9512' --header 'Content-Type: application/json' --data-raw '{
    "jsonrpc": "2.0",
    "method": "hmyv2_getTransactionsHistory",
    "params": [{ "address": "one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7", "fullTx": true, "txType": "ALL", "order": "ASC" }],
    "id": 1
}'
{"jsonrpc":"2.0","id":1,"result":{"transactions":[{"blockHash":"0xe30e9b3aea9f37ef5498a47ca159ce881495a32091a86e5fa914b8a94ec88311","blockNumber":56,"from":"one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7","timestamp":1583270509,"gas":21000,"gasPrice":1000000000,"hash":"0x116e9f2563274ed4d738fd991eb10ee03a4119c7e0a6366f38e8a3f298f860a7","input":"0x","nonce":0,"to":"one129r9pj3sk0re76f7zs3qz92rggmdgjhtwge62k","transactionIndex":0,"value":10000000000000000000,"shardID":0,"toShardID":0,"v":"0x28","r":"0x7bf59745ec4c7a786bedf5f6c908907aec738170debaeca64c6348f7f1b4af4b","s":"0x32976cdf4176cac714825ffd2bafe07720048cd0b5ce1d11284507c56d230ad0"},{"blockHash":"0xb44f8ad3a66365a582c39ee99b8a057a365acab7ee843f749150878a642db634","blockNumber":62,"from":"one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7","timestamp":1583270557,"gas":21000,"gasPrice":1000000000,"hash":"0xb6d7f3c80edc4593078edbc8b76069c226602990d1ea8c4be8ca6c86f49fc58a","input":"0x","nonce":1,"to":"one129r9pj3sk0re76f7zs3qz92rggmdgjhtwge62k","transactionIndex":0,"value":10000000000000000000,"shardID":0,"toShardID":0,"v":"0x27","r":"0x5f767ce4879e362a6cf485b34aa1c4fb8ad9ce380817fc8dac23a57cb54b7dd0","s":"0x27a02567c6ca28596ad488c4e11d71fce0d4d35a616f5bac82d20e8f269eb910"}]}}


Even shard 1 Explorer node returns shard 0 (same shard) transactions via hmyv2_getTransactionsHistory API.
How does the explorer node in one shard knows about txns on the other shard?