I can't see staff, baggage or passengers

[Puma]

It could potentially be related to this topic:

[Solved] Mac OS X High Sierra 10.13.6 Render Issue

No people are appearing. My airport has 8,000 people and no one is appearing. Not even the construction workers are appearing I don’t know why but my best guess is because of lag and preventing the game to crash. Someone give me a solution

Which OS version are you on?