end portal exit black screen

I went to the end, killed the ender dragon, went to the end islands and got an elytra, then jumped back through the island portal, and down the end portal to the overworld, and now it's a black screen, no credits, haven't tried logging out and back in again, don't want to lose my stuff

What I expected to happen was...:
End portal bring me back to overworld

What actually happened was...:
Black screen, no credits

Steps to Reproduce:
1. enter end
2. kill dragon
3. exit via portal