How EthereumAbiValue decode string works?

[stosabon]

I've tried to test with symbol string = "0x000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000045553445400000000000000000000000000000000000000000000000000000000"
It is working in online covnverter and returns "USDT" as expected https://www.moesif.com/solidity-abi-hex-decoder/encode
But with EthereumAbiValue.decodeValue with type "string" it returns empty string.
What am I do incorrect with parsing response?
But when I get decimals from eth_call and try parse as uint type it works as expected