Whenever I enter my end portal to go back home, it gets stuck on the dirt loading screen. I didn't sleep in a bed, I used /spawnpoint from a command block. This spawnpoint is not loading in an active chuck. It does this almost everytime.
This is on a flatworld, where there is no stronghold, so I used commands to make an end portal.
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The issue you've described is being tracked at MCPE-44815. Please add a vote to that ticket, and please copy your description above into a comment on that ticket and also add to your comment the coordinates where you set your spawn point, and your render distance (in video settings).
I will have this ticket resolved as a duplicate.