Mob overlays do not render

Cannot Reproduce, most likely relates to ressource packs.

i am using the default resource pack

What are your video settings

Graphics: Fast
Smooth Lighting: OFF
3D Anaglyph: OFF
GUI Scale: Auto
Clouds: OFF
Fullscreen: OFF
Mipmap Levels: 4
Render Distance: 16 chunks(32 chunks is still extremely glitchy)
Max Framerate: 60 frames
View Bobbing: ON
Brightness: Bright
Particles: Decreased
Use VSync: ON
Alternate Blocks: OFF
Use VBOs: OFF

Still unable to reproduce, please provide a screenshot with our F3 screen open.

i summoned a cow

Is the cow the invisible thing?

yeah. the cow's invisible. same thing happens with sheep

Update your graphic card drivers and see if the error persists.

still happens