Private transaction - Trying to add function or variables to the SimpleStorage.sol contract, but does not work

[Universe-art]

System information

Geth version: geth version
OS & Version: OSX
Commit hash : (if develop)

Expected behaviour

I run the private blockchain on my laptop. I want to implement a custom smart contract to test a private transaction.

I start from the example in the quickstart : SimpleStorage.sol and the script private_tx.js.

This contract has 2 functions : set and get, respectively to set a value and get it.

The script enables to create a private transaction between member 1 and member 3.

I add a function or a variable to the contract.

I then compile the contract, take the bin and abi, put them inside the SimpleStorage.json.

I run again the script private_tx.js

I am waiting that the script runs and produces the same result than before (member 1 and member 3 can see the value set and member 2 see undefined.

Actual behaviour

The 3 members see the value undefined

Steps to reproduce the behaviour

Backtrace

[backtrace]

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