Hi Anonymous

No, unfortunately I cannot say where it came from. However, mostly it seems copy/paste from external websites to iD.

Please see full discussion here: https://community.openstreetmap.org/t/automated-edit-proposal-convert-non-standard-dashes-to-standard-dashes/110206

In this thread, it was mentioned that editors (iD/JOSM) should be aware of that. And they are already, indeed.

Best,
Matheus