Chunks below Y: 0 are missing, it is not a render issue, the blocks literally do not exist anymore.

I don't know if this has only just occured with the recent beta update or if it's occurred in a past update, but I hope it's recent otherwise my world is just missing chunks.

Can anyone else confirm if this is a brand new bug? I have back ups of my world dating back beforehand if that's true and I really hope that's the case so I can revert to a fixed version :/

Edit: I didn't see in the beta update patch notes that this was a known issue, regardless this has happened in a world that has continuously opened and updated throughout the beta, and is not an "old world" going off of those words this bug shouldn't of applied to this world but it did.

My world is kinda just like this now I guess lol.