Deploy gas issue for require reason string

Question

I found a strange case and didn't find out why.

...
modifier onlyMaster() {
        require(msg.sender == master || msg.sender == developer, "caller is not the master");
        _;
    }
...

Deploy Gas amount: 1183967

I tried to delete some words for saving deployment gas as follows.

...
modifier onlyMaster() {
        require(msg.sender == master || msg.sender == developer, "caller is not master");
        _;
    }
...

Deploy Gas amount: 1186943

But the gas amount was increased against my prediction like this.

Other omissions decreased the gas amount but only this omission increased the gas amount.

So I created a very simple smart contract and tested it.

contract Demo {
    address public master;
    uint256 public callTimer;
    function setMaster(address master_) external {
        master = master_;
    }
    
    function demoFunction() external{
        require(msg.sender == master, "caller is not the master");
        callTimer++;
    }
}

I removed "the" and the deploy gas amount was decreased just I thought.

I am sorry that I can't provide the whole code, but has anyone ever had a similar experience?

What's the reason?

FYI, the "caller is not the" string is not repeated in the smart contract.