I was playing my Hardcore world, nothing crazy happening, then when leaving the game it said I was out of storage space. I have 8 worlds most of which between 100-300 MB. Hasn't been an issue before when I had 11 worlds holding 1g of data. Anyway now when I try to get on my hardcore world nothing is loaded, and it won't sync to the cloud.
This issue is being tracked at MCPE-197900.