One automation has disappeared from GUI

I have an important automation which is not triggered every day but it was present in the GUI a week ago. Today, I wanted to disable that automation temporarily and could not see it in the GUI. Since I did not delete that automation, I checked in automations.yaml file and it is very much present. How can just one automation disappear from GUI? How do I bring it back?

All other automations which are in automations.yaml file are present in the GUI.
Thanks…

look in the homeassistant.log file in your config directory to see if there is any error listed for the automation in question.