Describe the bug

Some Goblins spawn invisible and can not be hurt. They disappear on restarting the world

To Reproduce
Steps to reproduce the behavior:
Just wait during night

Expected behavior

The goblins to be visible and for them to be able ro take damage

Screenshots

Info (please complete the following information):

• Modpack Version:
  • 2.77.5
  • 3.0 BETA 5
  • Other:
• Server or Singleplayer:
  • Server
  • Singleplayer
• Version the world was created on:
  • 2.77.5
  • 3.0 BETA 5
  • Other:

Additional context

Maybe an issue with optifine settings?

Goblins only appear underground, and for the ones that do, all of them appear to be visible. However, occasional magma grunts are still being affected by this invisible entity issue.