Sandbox placeholder files in .git

“java.io.IOException: Empty 'commondir' file: /work/repo/.git/commondir”

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I hit this bug: rapsheet.dev/sheets/claude-code/issues/19005/file
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Sandbox leaves placeholder files in .git that break tools. A one-byte "." .git/commondir file (and in Windows reports empty gitdir) remains in the main git directory; JGit and worktree creation reject it.

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File my report

Where: Sandbox
Error text: java.io.IOException: Empty 'commondir' file: /work/repo/.git/commondir
Versions: 2.1.311
Platforms: Linux, Windows
How bad: Breaks a normal workflow.

Part of: Sandbox breaks git operations3 bugs

Git over SSH fails in sandbox4 people
Sandbox leaves .git/config.lock4 people

Not quite your bug?

Sandbox read-only bind breaks Bash3 people
Empty .git treated as repo root2 people

Original reports2, newest first

Oct 27, 2026Linux sandbox leaves .git/commondir containing ".", which JGit-based tools such as Spotless reject#105401
Oct 17, 2026Desktop (Windows): sandbox placeholder files in .git (gitdir/commondir) make "Start with worktree" fail#103098