This is a follow-up to this question: Can a magical net be destroyed?
Let’s say you have a +1 net which you throw at a target. The target then uses one of its attacks to attack the net, touching it and dealing enough damage to break it.
After defeating the target, you take the pieces of your destroyed net and mend them back together (using the Mending cantrip). Would that give you back your +1 net, or just a plain non-magical one?
This question is in the scope of Adventurers League, where it is indeed possible to get a +X net (if the magic item is a +X weapon if any kind).
Best Answer
The magical net would be repaired with magical nature intact
Mending says:
Magical items do not lose their magic when they break
There are also no general or specific rule that says or even implies that magic items lose their magic when broken. In fact the wording of mending itself implies the opposite.
Mending says it can "repair a magic item". If magic items automatically lost their magical properties when they broke what purpose would this sentence even have? All broken items would be mundane and there would be no need to say anything about repairing magic ones.
So even while broken, the net is still magical. Thus, the spell does not need to restore the magic to that item, because it never lost it to begin with. Thus, when repaired, the net is still magical.
If a magic item had lost its magical properties from some other effect (eg a wand using all of its charges) then mending would not restore those.
Be careful about the specific restriction of mending
As long as your repair meets all the rest of the requirements for mending, the rules should allow it to work.
Of specific concern will probably be the fact that mending can only mend a 1 foot tear. This will likely come down to a DM ruling on whether the damage fits this criteria and if it will take multiple mendings to repair.