While playing around with Vaults and Trial Keys, I discovered an inconsistency about NBT checks.

Vaults' item_key tag checks if all NBT tags match, instead of just the defined ones in the tag.

I explain myself:

1. Setblock a vault with 

   {config:{key_item:{id:"minecraft:trial_key",Count:1,tag:{Tags:["test"]}}}}

2. Give yourself a trial key with 

   {Tags:["test"],display:{Name:'{"text":"Super key!"}'}}
   

   • It won't work, as the vault checks for all NBT
3. Now, give yourself a key with just 

   {Tags:["test"]}
   

   • It will work, because the whole NBT match

That's an issue if a player renames their key item, because it will no longer match the vault's key item.