PHP syntax highlighting breaks in embedded SQL strings with unmatched [ after escaped quote

VSCode appears to detect SQL statements inside PHP strings when the string starts with an SQL keyword such as `SELECT`, `UPDATE`, `INSERT`, or `DELETE`. An unmatched `[` inside such an embedded SQL string causes syntax highlighting to remain in an incorrect state after the PHP string has ended.

```
$fetch = DB::query('SELECT id FROM mytable WHERE myfield LIKE \'%[search_word%\'')->execute();
```

These work correctly:
```
$x = '\'%[abcdef\'';
$x = 'SELECT \'%[abcdef%]\'';
$x = 'SELECT "%[abcdef"';
```
This does not:
```
$x = 'SELECT \'%[abcdef\'';
```

Does this issue occur when all extensions are disabled?: Yes

Version: 1.136.0-insider (user setup)
Commit: 222818cc1d871f299b909604ea267e955182d2a4
Date: 2026-08-26T11:28:05Z
Electron: 42.8.1
ElectronBuildId: 14906494
Chromium: 148.0.7778.280
Node.js: 24.18.1
V8: 14.8.178.38-electron.0
@github/copilot: 1.0.81-0
@github/copilot-sdk: 1.0.11
OS: Windows_NT x64 10.0.26200

Steps to Reproduce:

```