Orange Taggant?

I have two copies of Canada #1349 (Blueberries) that show a small pair of squiggly lines about 4mm long and 2mm apart. On both copies, they are similarly spaced, but placed differently. These glow orange under 380nm UV light.

It does not look to be part of a postmark, and I don't see this on any contemporary stamps that I have.

Is this a taggant or is it a cancellation? Nothing in my Unitrade mentions this (at least as far as I have seen)

Or something else?

Thanks
Dave