For OCP 4.11 toolbox container doesn't have sos package installed.

$ oc debug node/ci-ln-l8xrfpk-72292-rhrbv-master-0
sh-4.4# chroot /host
sh-4.4# cat /etc/os-release  
NAME="Red Hat Enterprise Linux CoreOS"
ID="rhcos"
ID_LIKE="rhel fedora"
VERSION="411.85.202206032330-0"
VERSION_ID="4.11"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Red Hat Enterprise Linux CoreOS 411.85.202206032330-0 (Ootpa)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:redhat:enterprise_linux:8::coreos"
HOME_URL="https://www.redhat.com/"
DOCUMENTATION_URL="https://docs.openshift.com/container-platform/4.11/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="OpenShift Container Platform"
REDHAT_BUGZILLA_PRODUCT_VERSION="4.11"
REDHAT_SUPPORT_PRODUCT="OpenShift Container Platform"
REDHAT_SUPPORT_PRODUCT_VERSION="4.11"
OPENSHIFT_VERSION="4.11"
RHEL_VERSION="8.5"
OSTREE_VERSION="411.85.202206032330-0"

sh-4.4# toolbox
Trying to pull registry.redhat.io/rhel8/support-tools:latest...
Getting image source signatures
Checking if image destination supports signatures
Copying blob 545277d80005 skipped: already exists  
Copying blob f70d60810c69 skipped: already exists  
Copying blob cae7320018ab done  
Copying config a8419564b7 done  
Writing manifest to image destination
Storing signatures
a8419564b7cc1417d26300d4560ce5812dccaee0c5ec88e22956ad5e67b32037
Spawning a container 'toolbox-root' with image 'registry.redhat.io/rhel8/support-tools'
Detected RUN label in the container image. Using that as the default...
19b8f2ae365e8d6c858ee5a5d057f12dd176b6592da7ef32c2ead33d6764668d
toolbox-root
Container started successfully. To exit, type 'exit'.
[root@ci-ln-l8xrfpk-72292-rhrbv-master-0 /]# sos report
bash: sos: command not found
[root@ci-ln-l8xrfpk-72292-rhrbv-master-0 /]# rpm -q sos
package sos is not installed

This is not reproduced on quicklab, Jake Hunsaker will share more info about that.