In shell/caucase.sh line 1134:
    trap "kill \"$caucased_pid\"; wait; rm -rf \"$tmp_dir\"" EXIT
                 ^-----------^ SC2064: Use single quotes, otherwise this expands now rather than when signalled.
                                                 ^------^ SC2064: Use single quotes, otherwise this expands now rather than when signalled.

These variables are local, so immediate expantion is expected.