There spawn almost no entities when before there were a lot more entities spawning.
Steps to reproduce:
1. Use latest spigot version without any plugins.
2. Generate the world in spigot with seed "-1675211156672571623" and use render distance 10. Go to the location -21075 78 -11057.
3. Open your F3 screen and see there are +- 20 entities.
4. Create in vanilla a world with the same seed and go to the same location.
5. Open your F3 screen and see there are +- 70 entities.