Calendar suddenly making numbers I type in notes turn into phone numbers!

I've used Mac calendars most of my life and never seen this behavior.

Suddenly when I type numbers into the Notes section of calendar events (like a hotel confirmation number) it makes it turn into a hyperlink (!) and shows up above the date with a little telephone icon as if you would click that and call the number.

I have ZERO interest in this (!) and I need to be able to enter numbers in notes - airline travel & tail numbers, confirmation numbers, prices, all sorts of this that are used for the many events I book.

I have never seen this telephone icon appear and I've never had all my numbers turn into links - which if you go click to change or correct them launch Skype to try and dial some international call.

Good lord, there must be a way to disable this. Is this something new with Big Sur?

I was running High Sierra before I bought this new Mac with Big Sur last April but haven't encountered this behavior until today.

Any help is appreciated.

Thanks!