sat is null

[yaron999]

version：0.9.0
request：http://127.0.0.1/inscription/7f5eaffc3238ad372d33db9057eceaa525f049803e24d121a7b75323fe7cd854i0
start：ord --bitcoin-rpc-user 123 --bitcoin-rpc-pass 123 --bitcoin-data-dir E:\BtcData --data-dir E:\ord --index-sats -e server
return：{
"address": "bc1pcspvrdxcfsg7wj45fp2rrsf25274j6txdwsrt894sqdkk330ssqsfcd3gu",
"children": [],
"content_length": 57,
"content_type": "text/plain;charset=utf-8",
"genesis_fee": 4392,
"genesis_height": 809075,
"inscription_id": "7f5eaffc3238ad372d33db9057eceaa525f049803e24d121a7b75323fe7cd854i0",
"next": "3f2d2fe2409dd126ae20ee27f33dd86edbefffdd2538278911630a7d39df0058i0",
"number": 34382000,
"output_value": 546,
"parent": null,
"previous": "2c0f96a2e98e4f633ac76112ca99680c79be57593946195b9e225fd54b6fe04di0",
"sat": null,
"satpoint": "5f67267e844bb1881d8fbf4f8783032adbb9bbc9786ae6bf221d6c75fd09a0da:1:0",
"timestamp": 1695522602
}
The question is:Why is sat null？
Can you help me point out my problem，I would appreciate it.