In the world that I’m in, I have a lot of pandas with different personalities. When I was off doing something else and came back, some of the pandas disappeared. I named some of the pandas and when I tried to make it teleport to me, it wouldn’t work. Good thing I have a backup of that world just in case if it happened. I just don’t want to re-spawn them again.
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What I meant to say was that I made the pandas teleport to me using the command /tp. When I load the world up, I believe they were on the chunk borders since I trapped the pandas so they couldn’t escape.

Thank you for your report!
We're actually already tracking this issue at MCPE-21416, so I will resolve and link this ticket as a duplicate.
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Pandas do not teleport to you when you name them. Also, were some of your pandas located on chunk borders?