Debug tracing via debug_traceCall endpoint does not work on private smart contracts

[rodion-lim-partior]

System information

Geth version: 1.10.3
OS & Version: Linux
Commit hash : 65de7ae

Expected behaviour

When running debug_traceCall api, private transactions to private smart contracts read from private state db

Actual behaviour

Private transactions to private smart contracts read from public state db, causing tracer to return 0x in simulated output

Steps to reproduce the behaviour

Send a private transaction's data to a deployed private smart contract via debug_traceCall JSON rpc

Backtrace

Expected to return an array of op codes and their corresponding program counter, stack and storage.

>debug.traceCall({to: "0x717a.....}, "latest")
  failed: false,
  gas: 21204,
  returnValue: "",
  structLogs: []
}

[rodion-lim-partior]

PR opened at #1673, @antonydenyer could you kindly help to take a look at this too please? Thank you.