Under the hood
Git fetch debug tracing now runs with only GIT_TRACE_PACKET set, not the full environment
What
When Claude Code retries a git fetch with packet-level tracing turned on (a debug mode that logs the raw network exchange for troubleshooting), the process it spawns for that retry used to inherit the full parent environment plus the GIT_TRACE_PACKET variable. It now runs with only GIT_TRACE_PACKET: "1" set, and nothing else from the surrounding environment.
Why
This narrows what the traced git process has access to during the retry, which mainly affects debugging output rather than normal git operation.