checkErrorsMode: "onValueChanged": Validation error doesn't disappear even though the dependent field was corrected

[JaneSjs]

T18952 - Validation on 2 dependent fields not updating each others errors
https://surveyjs.answerdesk.io/internal/ticket/details/T18952

---

Consider the following survey definition:

{
 "logoPosition": "right",
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "panel",
     "name": "panel1",
     "elements": [
      {
       "type": "dropdown",
       "name": "a",
       "title": "A",
       "validators": [
        {
         "type": "expression",
         "expression": "{a} + {b} <= 10"
        }
       ],
       "choicesMax": 10
      },
      {
       "type": "dropdown",
       "name": "b",
       "startWithNewLine": false,
       "title": "B",
       "validators": [
        {
         "type": "expression",
         "expression": "{a} + {b} <= 10"
        }
       ],
       "choicesMax": 10
      }
     ],
     "title": "The sum of two fields should be less than 10"
    }
   ]
  }
 ],
 "checkErrorsMode": "onValueChanged"
}

To reproduce the issue, follow these steps:
https://github.com/surveyjs/survey-library/assets/22372972/a676aec2-8243-4249-95cd-5d75d428482d