Paper 1.14.4 problem , spaming mobs

Hello. I can’t create a thread yet so I’m turning here. The server at 1.14.4 we at 20-30 players will start producing a huge number of mobs (3000-6000) Then the server will start lagging. According to Majong, this should be fixed. Therefore, I want to ask for a solution. Thank you for all the advice