Having "Auto Wake Up After Teleport": true, under NTeleportation's config fixes it

This does not fix the issue btw, I have had my auto wake up after teleport on the whole time and I still get foundations being deleted.

Hi Hwang85, sorry you're having an issue, but it's not this one. This was specific to players teleporting and not waking up at least once before they disconnected. If the option were enabled, and the player woke up, then you could not have this issue. Multiple servers have told me the issue is resolved, so I will be marking this thread as closed. 

I will provide some help before I close, of course. I won't leave you in the dark.

TC plugins and those with wallpaper options are known to cause your issue. TruePVE is not one of them, it's wallpaper option is unaffected. The easiest solution is to disable the wallpaper option in other plugins. If you restart, you may still have that issue because the damage was already done. Though it shouldn't continue to happen after a day or so. No other plugin is known to cause that issue.