I was flying high in the sky, full durability on the Unb3 elytra, fully enchanted netherite armour, full health and hunger, no chunks were loading under me tho, at some point i die and i get the "player fell from a high space" death message.
The world i'm playing in was generated in 1.12 but i have since played without any major issue. The chunks i were flying on were newly generated, maybe that could be involved with this strange bug.
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With you saying the chunks were not loading, you may have run into terrain you could not see, and it had killed you. (The "fell from a high place" death message can be awarded for dying with an elytra if the player hits the ground at a certain angle)
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Other than that, the decribed behavior of the terrain generation not keeping up with your flight speed seems to duplicate MC-166420 which was marked as invalid. (Unless there is more information not provided here)
This also could be a dupe of MCPE-120140
Please give me more info, it's seems that your elytra broke and you fell to death (Because if you hitting a wall while flying, it's give the death message "<player> experienced kinetic energy").