Code Completion preferences page opens empty when selected from Preferences search results

### Description

When the Code Completion page is opened from the Preferences search results, the page content is not displayed.

### DBeaver Version

Community Edition 26.1.0

### Operating System

Windows 11 Pro

### Database and driver

PostgreSQL 10

### Steps to reproduce

1. Open a DBeaver.
2. Connect to a database with schemas.
3. Open Window -> Preferences.
4. In the Preferences search field, enter "code".
5. In the search results, select Database -> SQL Editor -> Code Completion.
6. Observe the content of the selected page.
7. Select any other item in the Preferences tree.
8. Select Code Completion again.

### Additional context

The same issue can also be reproduced for Database -> SQL Editor -> Code Editor.
When the page is selected from the Preferences search results, the content area is empty until another preferences page is selected and the target page is opened again.