In the video example, the end crystals are all deleted but the one that duplicates itself persists.
This has resulted in random explosions and the destruction of builds.
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Thanks for your report. Does this only happen when you teleport long distances? Do you have command blocks that are supposed to replace the end crystals, which could be getting triggered?

This bug occured during the issue of the worlds loading and saving very slowly, since that fix this issue doesn't happen anymore or at least I haven't seen anything teleport or duplicate itselt again yet.
There is no command blocks that replace the end crystal, they're placed as decoration behind barrier blocks on them little 3x3 stands, the one that appears shouldn't even exist it was a very strange bug, but again I don't know if it's still occuring for anyone else since I haven't seen it happen since the long load/save glitch, but it is accompanied by very flashy and glitchy chunk loading, so it could be related.
It would also happen if you reloaded the chunk by moving far enough away.

Thanks for the additional information. I will resolve this as a duplicate of MCPE-152893.