This is a very interesting issue I seem to be having with a certain texture pack on the Switch version of Minecraft. I have checked the texture on the Xbox version and the Switch versions of Minecraft and it only affected the Switch.

What it is: The Chroma Hills HD Texture Pack by Syclone Studios

What it causes: When I activate this texture pack on a world (old or new), I immediately get a notification that there was a communication error. When the world is loaded, it loads the texture pack's loading screen. It will pause loading immediately, continue to play music, only for the entire program needing to close on my Switch due to an error. I have tested another texture pack (i.e. Beyond the Lands or the Natural Texture) on the world but it seems that certain save file has been permanently lost. When I first load a world with a non-problem causing texture pack, and then replace the texture with Chroma Hills, the problem presents itself. No textures seem to glitch or corrupt data within the world, the only issue is Chroma Hills crashes my entire game, then renders the world inaccessible.