You probably went near someone’s dancer, they remove corruption ^^
If you’re daring enough to make the venture downward yourself consider making a bunch of bedrolls, place them as you go so if you die, just select bedroll and return to pick your dead body back up.
As for your benches and stable disappearing this might be because those specific items do not have full decay timer. If you do not interact, go near or they are not connected to (usually) at least 20 interconnected building pieces/placeables, it has a low decay timer and is removed.
You can check to see if they decayed by accessing your event log, I am not sure the controls on PS, but in the main menu when you’re logged into the server. Ensure you increase days and proximity.
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