Strange dump files occur frequently when I open a Java file

I am using VSCode Remote on WSL. The JDK version I am using is OpenJDK11 with Eclipse OpenJ9 VM.

Often when I open a Java file, some dump files will appear in the folder the Java file is in, together with the following VSCode Language Support for Java output.

j9shr.1012   *   ** ASSERTION FAILED ** at CompositeCache.cpp:2094: ((this->_commonCCInfo->oldWriterCount == _theca->writerCount))

Whenever these dump files appear, the run & debug button will disappear from above the main function of the Java file.

Environment

• Operating System: Windows 10 Pro Build 19041 Arch Linux (on the Windows Subsystem for Linux)
• JDK version: OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.8+10) Eclipse OpenJ9 VM AdoptOpenJDK (build openj9-0.21.0, JRE 11 Linux amd64-64-Bit Compressed References 20200715_697 (JIT enabled, AOT enabled)
• Visual Studio Code version: 1.50.1 d2e414d9e4239a252d1ab117bd7067f125afd80a
• Java extension version: Java Extension Pack 0.10.0 Language Support for Java 0.69.0

Steps To Reproduce

1. Enter code . in the folder where the Java file is placed in
2. In VSCode, open the Java file
3. If no dump file appear, close VSCode and start again from step 1

Please attach a sample project reproducing the error
QuickStart.zip

Please attach logs
ERR Connection got disposed.: Error: Connection got disposed.
at Object.dispose (/home/kkd/.vscode-server/extensions/redhat.java-0.69.0/dist/extension.js:1:80706)
at Object.dispose (/home/kkd/.vscode-server/extensions/redhat.java-0.69.0/dist/extension.js:1:140393)
at /home/kkd/.vscode-server/extensions/redhat.java-0.69.0/dist/extension.js:1:137049
at processTicksAndRejections (internal/process/task_queues.js:94:5)

Current Result

Very possibly some dump files with file name javacore.date_and_time.txt or Snap.date_and_time.trc, error messages in VSCode output

Expected Result

No dump file and no error message in VSCode output

Additional Informations

まず、記載された手順に従い、Eclipse OpenJ9 を使用した OpenJDK 11 上の WSL の VSCode Remote で QuickStart.zip を使って報告を再現します。生成された javacore または Snap ファイルと、extension.js の接続エラーを含む Language Support for Java の出力を調査します。完了とは、ダンプファイルやエラーメッセージがなく、実行/デバッグボタンが引き続き使用できる状態を指します。