Done on an almost empty server (1 player) (100 "frozen" ai) running at 90 Server FPS
Get a entities log via logEntities server exec.

Execute this in MP local on a client that has a backpack.

for "_i" from 1 to 100 do 
{ 
    backpackContainer player canAdd "U_I_CombatUniform_shortsleeve" 
};

Get another entities log via server exec and watch the stray entities pile up with every execution of the loop above.
So you end up with thousands of these just because you use canAdd or canAddItemToBackpack which also had the same behaviour (probably more).

> Loc:0, ForDel:0, Dstr:0, DmgDstr:0, DmgDead:0, Sim:1, Inv: 0, AnyPl:0, Out: 0, NetID:6:23402, Pos: [0.000000][0.000000][0.000000], N:Supply40
> Loc:0, ForDel:0, Dstr:0, DmgDstr:0, DmgDead:0, Sim:1, Inv: 0, AnyPl:0, Out: 0, NetID:6:23403, Pos: [0.000000][0.000000][0.000000], N:Supply40
`