Local SF 18 engine doesn't stop if pressing "Go deeper" button really fast

[Siderite]

Steps to reproduce:

1. Go to Analysis Board (initial position is good enough)
2. Start the local engine - I used SF18 15Mb (it should show the cloud eval)
3. Place your mouse over the + button that would start local engine anyway (goDeeper)
4. Refresh the page
5. Immediately as the + button appears, click it
6. Wait until you see the CPU go to 100%
7. Stop the engine

The engine should stop and the UI shows that to be happening, but the engine is still running in the background and consuming CPU.

ceval.worker.stop() or ceval.worker.destroy() do nothing.

I am not that versed into the local computer engine, especially with all the new versions, to realize what is going on. I will try to debug it, but don't count on me.

One can duplicate it with the console as well, if the mouse is too unwieldy, by preparing the statement site.analysis.ceval.goDeeper() just before refresh, then pressing Enter in the DevTools console.

[Siderite]

The only difference in the ceval object that I see is that there is still work there. When the engine closes correctly, there is no worker.protocol.work object.

"worker": {
    "info": "[info is the same as activeEngine]",
    "status": "(e={})=>{this.ctrl.available()&&(this.ctrl.download=e.download),e.error&&(U(e.error),this.ctrl.engineFailed(e.error)),this.ctrl.opts.redraw()}",
    "start": "e=>this.protocol.compute(e)",
    "stop": "()=>this.protocol.compute(void 0)",
    "engineName": "()=>this.protocol.engineName",
    "destroy": "()=>{var e;(e=this.module)==null||e.uci(\"quit\"),this.module=void 0}",
    "protocol": {
      "expectedPvs": 5,
      "options": {},
      "send": "o=>i.uci(o)",
      "work": {
        "variant": "standard",
        "threads": 23,
        "hashSize": 512,
        "stopRequested": true,
        "initialFen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
        "moves": [],
        "currentFen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
        "path": "",
        "ply": 0,
        "search": {
          "depth": 99
        },
        "multiPv": 5,
        "threatMode": false,
        "emit": "c=>this.onEmit(c,a)"
      },
      "currentEval": "[currentEval is the same as curEval]",
      "engineName": "Stockfish 18"
    },

[Siderite]

I could "fix it" by not allowing goDeeper until there is a ceval.curEval object defined.