With the latest update this problem has occurred again. (june 2024 This maybe due to data corruption as the world is 7 years old.
I've noticed that this happens near where new terrain appears. When I quit and restart the game some terrain is changed in already explored chunks. The chunk with the player is always deleted including bedrock.
This time the game crashed my entire pc so i was ready with a screen recorder and world copy.
I have a small video showing what has happened.
https://drive.google.com/file/d/1sXnH_LPZ7liqAIOTBG26xpXym6K2RGdH/view?usp=drive_link
I can now confirm that the chunk had vanished (trail ruins) also 2 others nearby. Also terrain to one side has completely regenerated. (It's now an ocean instead of a jungle)
I hope that fixed it. here's the link again.
https://drive.google.com/file/d/1PXoFQwOvRvRrbI04Dt9sdEj8C4-ufzg1/view?usp=drive_link, https://drive.google.com/file/d/1dBb2AHK_ufT0ZeGPYJwMGwgL542ttvDb/view?usp=drive_link
The save was too big to attach. Here is a link to the loose files and world file.
https://drive.google.com/file/d/1PXoFQwOvRvRrbI04Dt9sdEj8C4-ufzg1/view?usp=sharing, https://drive.google.com/file/d/1dBb2AHK_ufT0ZeGPYJwMGwgL542ttvDb/view?usp=sharing
video
https://drive.google.com/file/d/1kakRwXpl9uvczOYhUc9JNVG2FlI7sm5r/view?usp=sharing
world;
https://drive.google.com/file/d/14b4kLxCCbRgSOOEnlO6Uxt0aNi0eLzYl/view?usp=sharing