[BUG] CLI CloudeCode Chat silenty CORRUPT pasted text.

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Large text blocks pasted into Claude Code have $' silently stripped before escape sequences like $'\t', but only intermittently and only in larger pastes. This is a data integrity issue with no user-visible warning.

What Should Happen?

The Chat Interface should NEVER discard anything. This is very serious bugs, I can no longer trust the integrity of any text I'm pasting.

Error Messages/Logs

None.

Steps to Reproduce

I'm pasting the following code snippet in the CLI Chat interface:

sudo \
    bash -o pipefail -O inherit_errexit -euxc "$(cat - 0<<'cmdEOF'
: '--- Cleaning Package Manager. ---'
dnf -y remove $(dnf5 repoquery --installonly --latest-limit=-1 -q) || true
dnf -y autoremove
dnf clean all

: '--- Removing `cloud-init` cache to force new instance to re-run it. ---'
rm -rf /var/lib/cloud/*
echo 'localhost' > /etc/hostname

: '--- Removing SSH Host Keys. ---'
rm -f /etc/ssh/ssh_host_*_key
rm -f /etc/ssh/ssh_host_*_key.pub

: '--- Removing Root and Default User SSH directory. ---'
rm -rf /root/.ssh/
rm -rf "$(getent passwd 1000 | cut -d: -f6)/.ssh/"

: '--- Removing non-Default Users. ---'
awk -F: '(($3 >= 1001) && ($1 != "nobody")){print $1}' /etc/passwd | \
    xargs -r userdel -r

: '--- Removing non-Default Groups. ---'
awk -F: '(($3 >= 1001) && ($1 != "nobody")){print $1}' /etc/group | \
    xargs -r groupdel

: '--- Removing Default User & Group. ---'
chown -R 1001:1001 {/home,/var/spool/mail}/"$(id -nu 1000)"
sed -E -i 's/^(([^:]*:){2})1000:1000:/\11001:1001:/' /etc/passwd
sed -E -i 's/^(([^:]*:){2})1000:/\11001:/' /etc/group
userdel -r "$(id -nu 1001)"

: '--- Clearing `machine-id` for unique Instance Identity. ---'
truncate -s 0 /etc/machine-id
rm -f /var/lib/dbus/machine-id

: '--- Removing Random Seed. ---'
rm -f /var/lib/systemd/random-seed

: '--- Removing Temporary Files. ---'
rm -rf /tmp/*
rm -rf /var/tmp/*

: '--- Cleaning up Log Files. ---'
find /var/log -type f \( \
    -name '*.log.*' -o \
    -name '*.gz' -o \
    -name '*.bz2' -o \
    -name '*.xz' \
\) -delete
find /var/log -type f -name '*.log' -exec truncate -s 0 '{}' \;

: '--- Turning off Swap. ---'
swapoff -a || true

: '--- Zeroing Swap Partitions. ---'
(
    # Zero only Disk-based Swap Partitions (skip RAM-based swap).
    for sd in $(
        blkid -t TYPE=swap -o device |
        grep -vE '/dev/(zram|loop)'
    ); do
        echo "Zeroing Swap Partition ${sd@Q}..."
        dd if=/dev/zero of="${sd}" bs=1M status=progress || true
    done
)

: '--- Zeroing Volumes. ---'
(
    # Get only Block Dev. Mount Points (excluding tmpfs, devtmpfs, etc.).
    while IFS= read -r mp; do
        echo "Zeroing free space on ${mp@Q}..."
        touch "${mp}/zerofile"
        chattr +C "${mp}/zerofile" 2> /dev/null || true
        dd if=/dev/zero of="${mp}/zerofile" bs=1M conv=fsync status=progress || true
        rm -f "${mp}/zerofile"
    done 0< <(
        # FS without sub-vol.
        df -t ext4 -t xfs -t vfat --output=target |
        tail -n +2
        # B-Tree FS: pick the least quota-restricted sub-vol. per dev.
        df -t btrfs --output=source,avail,target |
        tail -n +2 |
        sed -E 's/  */\t/; s/  */\t/' |
        sort -t $'\t' -k 1,1 -k 2,2rn |
        awk -F '\t' '!seen[$1]++ {print $3}'
    )
)

: '--- Cleaning up `systemd journal` Logs. ---'
journalctl --rotate
journalctl --vacuum-time=1s

: '--- Cleanup complete. Shutting down. ---'
shutdown now
cmdEOF
    )"; echo $?

The line: sort -t $'\t' -k 1,1 -k 2,2rn got corrupted to sort -t \t' -k 1,1 -k 2,2rn, it silently discard $' in front of \t. ONLY occurs if I copy and paste the whole block. Smaller block or just that line works.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.38 (Claude Code)

Platform

Google Vertex AI

Operating System

Other Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_