Modpack version
1.79a updated to 1.80 3 days ago

Issue
About 3 hours ago the first 3 of the above issues surfaced one after the other. I went AFK for a bit and died afterwards, after which the grave waypoint didn't appear(I checked if I haven't changed the minimap's settings accidentally,didn't seem to be the case, to make sure I killed my character,which didn't create a waypoint. Luckily the graves were there). The quest book just got completley reset and after I completed the ones I had already finished with a little help from creative mode I noticed that the loot boxes weren't generating loot( IIRC the message they were giving was something along the lines of "loot tables not set"). I feel like the spice of life problem is pretty self explanatory. I tried loading a backup from 2 hours before it started,sadly the problems were still there.

Logs
I'm not sure which logs could help with this, but if one is required I'll try to provide them ASAP. Thanks in advance.

We use the issue tracker exclusively for bug reports, development and feature requests. However, this issue appears to be a support request. Please use the support channel on our Discord to get help.

The Spice of Life issue is known, cannot be fixed as far as I know :(

In regards to quest issues:

/bqs_loot default load to restore loot chests
A backup of your questdata exists within your world folder, you'll need to retrieve and restore that

In general it sounds like your instance got messed up, I recommend that you reinstall. I'm going to attach a link to my Discord in case you need further assistance - That doesn't mean you're not allowed to continue to post here, feel free to do so :)