I've only been recently noticing this. I don't know when it started, why it started, or how.
Here's what happened:
1. start up Blockland, do stuff and stuff
2. tried hosting, but found out an add-on isn't on the list
3. went to check in my folder
4. zip is there, but half the contents are missing (ex: my fillcan server.cs was gone
basically, the contents of my add-ons zips are disappearing