Minecraft wont open everytime the render dragon is activated

When opening Minecraft it goes to the Mojang screen. than just flickers red and black. unable to pass the main loading screen.

This issue happens everytime the beta has the render dragon activated

have done everything to try and solve issue which includes

1.Reinstalling

2.Updating gpu drivers

3. updating di os

etc. Please fix the bug or perhaps add a way to disable render dragon.