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  1. Minecraft: Java Edition
  2. MC-264412

.mcc files get deleted when server loads up

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    • Icon: Bug Bug
    • Resolution: Awaiting Response
    • None
    • 1.20.1
    • None
    • Java 17
      Vanilla Server
      1.20.1
    • Plausible
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      A player on my server had 2 chunks in his base that were filled with "9 months of unsorted shulkers inside double chests". Recently he logged on to find that these chunks had disappeared. I was perplexed for a while as when I had gone into the backup to load up the region file these chunks were in, the chunks were also gone on that file too. So then I found out that minecraft will save chunks into a file called c.xx.xx.mca if the chunks get to large (when a player fills a chunk with tons of data like shulker boxes etc). So i found the corresponding .mcc file from a backup from before his chunks reset. I copied those files along with the region file from that backup into a test server and loaded it up and those chunks are still missing when I load into the world. In the region/ directory I can see that minecraft deletes those .mcc files every time the server starts up. This is very weird.

      This was originally happening on a Purpur server, but then I reproduced it on a Vanilla server and the same thing happened.

      Files: (The region file was too large to attach.)
      https://cdn.discordapp.com/attachments/669916943058468884/1133359073820147783/r.-31.17.mca
      https://cdn.discordapp.com/attachments/669916943058468884/1133359072893206593/c.-986.545.mcc
      https://cdn.discordapp.com/attachments/669916943058468884/1133359073472028743/c.-986.546.mcc

       

        1. 2023-07-25_12.19.34.png
          2023-07-25_12.19.34.png
          3.03 MB
        2. c.-986.545.mcc
          1.52 MB
        3. c.-986.546.mcc
          1.80 MB

            Unassigned Unassigned
            Zepsi_Zola Zepsi
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              Created:
              Updated:
              Resolved:
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