Nested Dynamic Panel restores removed panels after value change when `panelCount` is set

[danlevison]

Describe the bug
When using nested paneldynamic questions, removing all panels from the inner paneldynamic does not update panelCount. After a subsequent value change in the parent panel (e.g. selecting a radio button), the removed panels are automatically recreated, even though the user explicitly deleted them.

This appears to be a state reconciliation bug where panelCount is treated as authoritative and forces panel re-creation on value changes.

Steps to reproduce

1. Load the following survey JSON:

{
 "pages": [
   {
     "name": "page1",
     "elements": [
       {
         "type": "paneldynamic",
         "name": "question1",
         "templateElements": [
           {
             "type": "radiogroup",
             "name": "question2",
             "isRequired": true,
             "choices": [
               "No",
               "Yes"
             ]
           },
           {
             "type": "paneldynamic",
             "name": "question3",
             "templateElements": [
               {
                 "type": "radiogroup",
                 "name": "question4",
                 "isRequired": true,
                 "choices": [
                   "No",
                   "Yes"
                 ]
               }
             ],
             "templateTitle": "{panelIndex}",
             "panelCount": 2,
             "panelsState": "collapsed"
           }
         ],
         "templateTitle": "{panelIndex}",
         "panelCount": 2,
         "panelsState": "collapsed"
       }
     ]
   }
 ],
 "headerView": "advanced"
}

2. Open question1 → panel 1
3. Open question3 → panel 1, then remove it
4. Open question3 → panel 2, then remove it
5. Select any option in question2
6. Observe that two panels are recreated inside question3

Expected behavior

• After removing panels from a nested paneldynamic:
• The panels should remain removed
• Subsequent value changes elsewhere should not recreate them
• panelCount should reflect the actual number of panels, or at least not force re-creation

Screenshots
https://github.com/user-attachments/assets/c7d3fa22-ad2e-42b6-b34b-046b7ceb7611

Browser/SurveyJS Versions

• Browser: Chrome
• Browser version: 143.0.7499.169 (Official Build) (64-bit)
• SurveyJS version: [e.g. v2.5.2]
• Device: PC