As
discussed on the AARoads forum, Quebec seems to have a short new Autoroute spur, A-915 in Saint-Jérôme. It's less than 2 km long. The online mapping cited in the AARoads post has long identified the spur as part of the Autoroute system, but until now not as a separate route. It's also shown in OSM as Autoroute 915.
This appears to be unsigned. It was when I field-checked it a few years ago, and seems to still be unsigned as of a month ago. July 2022 GMSV shows the spur signed only as part of A-15 southbound, and northbound only as QC 117/QC 333 (should be "Vers (To) QC 117/QC 333", but MTQ always omits the Vers).
I'm disinclined to extend our policy re: unsigned Interstates to Quebec's and other provincial freeway systems. We once had a supposed unsigned Autoroute in the HB, A-920. On further review, we found that it was not officially an Autoroute at all, and so removed it from the HB.
A-915 is also too short, IMO, to be added to cansf. So I would do nothing, until at least one A-915 marker is posted in the field.