This is by design. The created_by tag is deprecated. JOSM removes this tag automatically on objects that have been edited for by you. You should *not* remove it yourself since this is just not necessary. See [created_by#Guidance][1] for more information. [1]: https://wiki.openstreetmap.org/wiki/Key:created_by#Guidance

This is by design. The created_by tag is deprecated. JOSM removes this tag automatically on objects that have been edited for you. You should *not* remove it yourself since this is just not necessary. See [created_by#Guidance][1] for more information. [1]: https://wiki.openstreetmap.org/wiki/Key:created_by#Guidance