The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions/checkout@v3, actions/setup-dotnet@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Possible null reference argument for parameter 'caller' in 'Piece.Piece(Form1 caller, short rowindex, short fieldindex)'.