org.eclipse.jdt.core.compiler.problem.potentialNullReference preference not taken into account

Describe the bug
The value of org.eclipse.jdt.core.compiler.problem.potentialNullReference preference seems to not being taken into account.

To Reproduce
Steps to reproduce the behavior:

1. Create a settings.prefs file
2. Add following value to the just created prefs file:

org.eclipse.jdt.core/org.eclipse.jdt.core.compiler.problem.potentialNullReference=ignore

3. In VSCode, under customizations/vscode/setting, set java.settings.url value pointing to the settings.prefs file just created.
4. In the PROBLEMS view, any Potential null pointer access: The variable myVar may be null at this location error should disappear, but does not.

Expected behavior
The configuration is obeyed and the specified warnings disappear.

Environment

• Operating System: DevContainer with mcr.microsoft.com/devcontainers/base Docker image on Debian WSL under Windows 11
• JDK version: openjdk version "1.8.0_482" as Project Java version and openjdk version "25.0.2" 2026-01-20 LTS as the JVM to be used by the Java Language Server
• Visual Studio Code version: 1.114.0
• Java extension version: 1.53.0

Additional Information
Other configuration preferences seems to be working as expected. For example setting org.eclipse.jdt.core/org.eclipse.jdt.core.compiler.problem.deprecation=ignore removes any deprecation warning.

potentialNullReference 設定を含む settings.prefs ファイルを使って VS Code で問題を再現し、報告によれば動作する deprecation 設定と、その処理を比較します。これらの設定について、Java 拡張機能または言語サーバーの設定経路を追跡します。potentialNullReference を ignore に設定すると、報告されている潜在的な null 警告が削除されれば完了です。