openzeppelin-upgrades: Importing Interfaces breaks deployProxy

Updated the Box contract used on https://docs.openzeppelin.com/upgrades-plugins/1.x/truffle-upgrades Importing a simple interface. Makes the migrate command to throw the following contract Error: The requested contract was not found. Make sure the source code is available for compilation

When an interface is imported, checkForImportIdConsistency removes a contract from the input, output validated.

https://github.com/OpenZeppelin/openzeppelin-upgrades/blob/master/packages/plugin-truffle/src/validate.ts#L84-L105

.

@openzeppelin/truffle-upgrades/dist/validate.js

// contracts/Box.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "contracts/Itest.sol";
 
contract Box {
    uint256 private value;
 
    // Emitted when the stored value changes
    event ValueChanged(uint256 newValue);
 
    // Stores a new value in the contract
    function store(uint256 newValue) public {
        value = newValue;
        emit ValueChanged(newValue);
    }
 
    // Reads the last stored value
    function retrieve() public view returns (uint256) {
        return value;
    }

    function testing() public pure returns(bool) {
      return false;

    }

    function test() public view returns (bool) {
      Itest temp = Itest(address(this));
      return temp.testing();
    }
}

Oddly enough putting an inline interface presents works fine.