Multiple concurrent calls to evm_mine without awaiting will only mine 1 block

[MicaiahReid]

it("should mine `n` blocks if called `n` times without awaiting", async () => {
    const provider = await getProvider(option);
    const initialBlock = parseInt(
      await provider.send("eth_blockNumber")
    );
    let proms = [];
    for (let i = 0; i < 5; i++) {
      proms.push(
        provider.request({
          method: "evm_mine",
          params: []
        })
      );
    }

    await Promise.all(proms);
    const currentBlock = parseInt(
      await provider.send("eth_blockNumber")
    );
    assert.strictEqual(currentBlock, initialBlock + 5);
});

This test fails with expected: 5, actual: 1