How did I create note of phone call time and date on OnePlus 7 Pro

I use a OnePlus 7 Pro. After I made a call to Simon, I closed the Phone app and was left with a 'Notes' page with the text "outgoing call to Simon" with the time and date. By the way, after I tapped on the tick to confirm it, the note disappeared and I can't find it. How did I manage to create this note without meaning to? To be honest, I wondered if there might be something uninvited on my phone logging calls.