Error message after 10 secs of loading the world due to 'lack of data storage'

After 10 secs of loading the world it gives an error message and closes out of the world and goes to main menu, The message says the following:

''You are out of data storage space and Minecraft is unable to save your progress! Minecraft will return you to the Main Menu to clear up storage space''

I think this happens in Windows 10 when people online are in other parts of the world loading chunks.

I have over 504GB left on my PC so it has to be a bug, that world is less than 300MB

Minecraft version is Windows 10 (Bedrock) 1.4.2