Hey mate, I’m testing this and it works for me.
So…
(1) You have Google home setup
(2) Do you have the home icon on your lock screen in the bottom left corner and does this work?
(3) Have you tried removing it from the lockscreen and adding it again, rebooting your device or, logging in/out of Google home?
Failing all of that you might want to give feedback in the hope that support can help.
Settings > Systems > Feedback