I had just finished smelting 64 Iron and had hit the Y button while crafting buckets so in a desperate attempt to roll back the save to the last auto save I Alt+F4 the game and opened it through the Minecraft launcher, waited for the menu to load and entered back into the world hoping to find that my 64 Iron was still in my hand and well it was, even though everything (Other than things that could move like Chest and animals) around me had turned into a shade of dark blue. I should also mention that the world is still at least 30 -50 minutes old at this point.

If there a fix for this please let me know as the terrain in this world was pretty good.
Either that or I might just try to copy the seed and start over.

I have tried, putting on a texture pack only for it to turn the shade of blue, and Restart the Launcher

I'm running this version of Minecaft Bedrock edition from the Launcher on my desktop 

(I tested and the issue does not continue in newly made worlds)