pnpm --parallel exec does not prefix the output

[Leksat]

Verify latest release

• I verified that the issue exists in the latest pnpm release

pnpm version

No response

Which area(s) of pnpm are affected? (leave empty if unsure)

CLI

Link to the code that reproduces this issue or a replay of the bug

No response

Reproduction steps

Run pnpm --parallel exec echo "ok" in a monorepo

Describe the Bug

From https://pnpm.io/cli/exec

--parallel
Completely disregard concurrency and topological sorting, running a given script immediately in all matching packages with prefixed streaming output. This is the preferred flag for long-running processes over many packages, for instance, a lengthy build process.

However, the output is not prefixed

$ pnpm --parallel exec echo "ok"
ok
ok
ok

Expected Behavior

Something like

$ pnpm --parallel exec echo "ok"
packageA: ok
packageB: ok
packageC: ok

Similarly to pnpm --parallel run

Which Node.js version are you using?

18.19.0

Which operating systems have you used?

• macOS
• Windows
• Linux

If your OS is a Linux based, which one it is? (Include the version if relevant)

No response