black screen instead of credits

Put the summary of the bug you're having here

What I expected to happen was...:
for it to play end credits

What actually happened was...:
when i jumpeped in the end portal in the end after i killed the ender dragon i got a black screen

Steps to Reproduce:
1. goto the end
2. kill the end dragon
3. jump in the portal to get credits
boom black screen

i used spawned in end portal With /setblock command to get to the nether