I was refreshing the server list to see any servers were online
then apparently it deleted all my servers on my server list.
1. Go to Multiplayer
2. Click Refresh many times or spam it.
3. You triggered it!
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This happens a lot. All you have to do is rename the servers.dat_temp to servers.dat and you have them back again
Keep the game open while doing it or it gets deleted!
This happened with me bud. I just got all the servers back by adding the server address.