Task failure output is duplicated

[c0da-ricon]

Description

When a mise task fails (exits non-zero), the entire output (stdout + stderr) is printed twice.

Reproduction

mkdir -p /tmp/mise-repro/.mise/tasks

cat > /tmp/mise-repro/.mise/tasks/fail <<'SCRIPT'
#!/usr/bin/env bash
echo "this is stdout"
echo "this is stderr" >&2
exit 1
SCRIPT

chmod +x /tmp/mise-repro/.mise/tasks/fail
cd /tmp/mise-repro && mise run fail

Actual output

[fail] $ /private/tmp/mise-repro/.mise/tasks/fail
this is stdout
this is stderr
[fail] ERROR task failed

[fail] $ /private/tmp/mise-repro/.mise/tasks/fail
this is stdout
this is stderr
[fail] ERROR task failed

Expected output

Output should appear only once:

[fail] $ /private/tmp/mise-repro/.mise/tasks/fail
this is stdout
this is stderr
[fail] ERROR task failed

Behavior across output modes

Tested -o quiet, -o silent, -o interleave, --raw, and default — all show duplicated output on failure. Successful tasks are not affected.

Version

mise 2026.2.17 macos-arm64 (2026-02-19)