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The shell hint injected into agent context on Windows has been improved. When Bash is available alongside PowerShell, the hint now reads: "This tool runs Git Bash (POSIX sh), not cmd.exe or PowerShell. Use Unix shell syntax: /dev/null not NUL, forward slashes, $VAR not %VAR% or $env:VAR." The combined PowerShell + Bash hint also clearly distinguishes that each tool takes its own syntax.
Evidence
New shell hint strings (search for "This tool runs Git Bash (POSIX sh), not cmd.exe or PowerShell")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.