A March 2019 article in the Canadian Paper Money Journal talks about micro and hidden elements in Canadian Polymer Bank Notes.
Inspired by the recent post on close-up image of a Canadian Bank Note I thought I'd share one of my favourite hidden element - The black circle around the text is mine and used for illustration and it is not on the note itself:

I am sure it should be easy to guess where this can be found.
I have only found the English version. Perhaps someone can help find the French version