bitcoin-cli decodescript wrong output

[Bitcoin]

bitcoin-cli decodescript wrong output

If I try to get info in genesis block, there is 1 tx:

  "scriptPubKey": {
    "asm": "0496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858ee OP_CHECKSIG",
    "hex": "410496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858eeac",
    "type": "pubkey"
  }

bitcoin-cli decodescript gives me this address:

{
  "asm": "0496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858ee OP_CHECKSIG",
  "type": "pubkey",
  "p2sh": "3BgShGBxRQrczVD6Ftj4z51FfgJ761FdSX"
}

However any block chain explorers show address 12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX.
The same problem with 2, 3, 4... blocks. Why?

Source: bitcoin-cli decodescript wrong output