The Fish Net Trap, craftable from netting and metal wire, seems to have two bugs :

1] When crafted, the game doesn"t take account of how much netting you used to craft it and will use, for example, a full stack of 4 nettings to craft one single Fish Net Trap rather than using just one. (Normal behaviour would be the same as when crafting the Snare Trap, it will only take one stick out of a stack of five)

2] Once crafted, the Fish Net Trap will loose quality from Pristine to Ruined each time you drag it on the floor from your inventory. Normally, the trap could only loose quality when used to fish (like the Snare Trap, that looses quality each time a Rabbit is caught or each time the trap fails)