I believe it’s been changed to every 10k blocks as we discussed 5,000 would be too common especially further on in the season, but I’ve noticed when you’ve mined around 20,000 blocks you get rewards less. I believe this is purely down to a bug, which is understandable as it’s a fairly new addition, and the reset was very recently.
I don’t think there’s a chance of one spawning, I’m pretty sure it’s guaranteed you’ll get one every 10,000 blocks you mine, but the rewards inside the chest have different rarities and chances of spawning as
@Anxii_ said above.
I understand the frustration though, but please do understand that these additions are new and that there likely will be problems with them, especially in the near future. If you do experience any bugs/issues/glitches, please report them to a member of staff or submit a thread
here (Report a Bug). If you experience any issues, get as much proof as possible and submit a support ticket (
here), and staff will deal with it when they can.