Whenever my friend joins my world and I teleport to them, the game crashes. The same can be said when they join and we are still in the same chunk. I have had to resort to never coming close to them while we are playing together to make sure that we don't lose progress. This does not happen when anyone else joins the game, it seems to only be with the one person which is super odd.
Thank you for your report!
We're tracking this issue in MCPE-145957, so this ticket is being resolved and linked as a duplicate.
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