help me with a command

I'm trying to make a feature which allows you to keep your loot when killed specifcally only by players. i made a scoreboard objectives "Pvp" , u get 1 score when killed by a player
set a repeating command block with the command- 
execute as @a[scores={Pvp=1..}] run gamerule keepInventory true (Unconditional)
Followed by two chain command blocks-
scoreboard players reset @a Pvp (Unconditional) >  gamerule keepInventory false (Unconditional)
Despite the efforts, players drop their loot as usual when killed other players. Why doesn't it work?