HTTP API says "istanbul" is Unavailable but "istanbul" is required for HTTP endpoint for checking and adding validators.

[nvzvhenry]

System information

Geth version: 1.11.2-stable
OS & Version: OSX Darwin(darwin-arm64)

Expected behaviour

istanbul.getValidators("latest")
["e1a8d6a6866a6c8f25ed853e3f957b0ed06a8f1c", "6028d68da1df3c54d5f0949de6082fb69a7239d1", "c1ed779faf6975399c5bdb90b40e2f324185bad0", "6480d9bf06fc8ba9a0393976386e47a5c4f014de", "da4d64ac5fea8aaf2943680241ce9ca4befed870"]

Actual behaviour

ERROR[.........] Unavailable modules in HTTP API list unavailable=[istanbul] available="[admin debug web3 eth txpool personal ethash miner net]"

istanbul.getValidators("latest")
ReferenceError: istanbul is not defined
at :1:1(0)

Steps to reproduce the behaviour

geth --datadir data --networkid 1337 --bootnodes enode://----------------------@127.0.0.1:30303 --verbosity 5 --syncmode full --mine --miner.threads 1 --miner.gasprice 0 --miner.etherbase ${ADDRESS} --authrpc.port 8451 --http --http.addr 127.0.0.1 --http.port 8545 --http.corsdomain "" --http.vhosts "" --ws --ws.addr 127.0.0.1 --ws.port 8546 --ws.origins "*" --http.api admin,eth,debug,miner,net,txpool,personal,web3,istanbul --ws.api admin,eth,debug,miner,net,txpool,personal,web3,istanbul --unlock ${ADDRESS} --allow-insecure-unlock --password ./data/keystore/accountPassword --port 30303

Backtrace

[backtrace]

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