bug(Vm): setArbitraryStorage slot set to 0 reverts to arbitrary in test

[lucasmt]

I'm trying to write a setUp function that first uses the setArbitraryStorage cheatcode to make the storage of a contract arbitrary, then uses store to set a single storage slot to 0. This seems to work inside the setUp, but when the test itself is executed, the value of the storage slot goes back to being a random number. This seems to only happen when the value is 0.

Forge version:

forge Version: 1.0.0-stable
Commit SHA: e144b82070619b6e10485c38734b4d4d45aebe04
Build Timestamp: 2025-02-13T20:03:31.026474817Z (1739477011)
Build Profile: maxperf

Minimal Example

pragma solidity ^0.8.25;

import "../lib/forge-std/src/Test.sol";

contract StorageContract {
    uint256 public value;
}

contract ArbitraryStorageTest is Test {
    uint256 constant DEFAULT_VALUE = 0;

    StorageContract target;

    function setUp() public {
        target = new StorageContract();
        vm.setArbitraryStorage(address(target));

        bytes32 valueSlot = bytes32(uint256(0));
        vm.store(address(target), valueSlot, bytes32(DEFAULT_VALUE));
        emit log_named_uint("value in setUp", target.value());
    }

    function test_stored_value() public {
        emit log_named_uint("value in test", target.value());

        assertEq(target.value(), DEFAULT_VALUE);
    }
}

The test fails and this is what the logs show:

[FAIL: assertion failed: 36440280036344177981963967840477496355477405577495123809133350823800994840471 != 0] test_stored_value() (gas: 10093)
Logs:
  value in setUp: 0
  value in test: 36440280036344177981963967840477496355477405577495123809133350823800994840471

However, if DEFAULT_VALUE is changed to 1, the result is correct:

[PASS] test_stored_value() (gas: 10090)
Logs:
  value in setUp: 1
  value in test: 1