What about dropped items?

[mhtvsSFrpHdE]

World: abc  x: -3  z: -1  Entities: 27666

[Server thread/INFO]: *                          (Server Status)                           *
[Server thread/INFO]:    Items on the ground: 27710
[Server thread/INFO]:    Mobs alive: 72
[Server thread/INFO]:    Friendly-Mobs alive: 98
[Server thread/INFO]:    Players alive: 0
[Server thread/INFO]:    Chunks loaded: 287
[Server thread/INFO]:    Active hoppers: 156
[Server thread/INFO]:    Idle hoppers: 200
[Server thread/INFO]:    Active mob spawners: 8

They are dropped items, a player enters the area will hang the entire server.
I find several chunk limiters and discover only mob, animal entity can be configured in config.