We've identified an issue in the current Minecraft Beta and Preview version that causes chunks to become corrupted below Y=0. To avoid corrupted chunks, please refrain from opening your worlds until an update has been released. - jhp

My backups are saving every hour. Support responded, "read the bugs report to see if your isssue is addressed. If it's not addressed, a developer would look into it. Why do I have to read bug reports to determine if my issue was addressed? Isn't that their job?

Only a "community" member would respond like that. Either there's a fix or there isn't a fix. Do not tell me to read through reports to see if someone else reported it. If a realms subscriber is treated this way, I could only imagine how a person with a free acct is treated.