Try to repair a Shovel with duct tape. You can't. Same as the Hammer - which I reported in a separate report form.

Also on Livonia, the shovel wouldn't dig a garden plot. The plot was white (not grey). Held RMB and the timer wheel immediately closed.
Tried different places far away from any structure, and it was the same. Though this being DayZ, it will probably work next time I try it.
But the repair one is 100% for real.