Numerical app?

New OS 12 has screen time added. When I go to "allowed apps" I am seeing a numerical app - long number 51982B181A5A46... This does not show in my app usage area or apps listed in main settings area - it only shows in the screen time apps allowed section (where you can add to the no-restricted downtime allows). I never downloaded a numerical app with no name or identifier!

My question is what is this? Is it a hidden hack or something malicious on my phone?

I cannot find any references anywhere to this. I have put this into iPhone hardware section because I don't see an apps or similar section.