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I narrowed the copy of your compose to just the primary parts and it started up fine for me.

I changed two things:

  1. Using java21 image since Fabric 1.20.1 is more compatible with that. Besides Spark caused a fatal JVM crash with Java 25.
  2. Added fragmentum-fabric and geckolib since the initial logs said it needed those
services:
  mc:
    image: itzg/minecraft-server:java21
    tty: true
    stdin_open: true
    ports:
      - "25565:25565"
    environment:
      VERSION: "1.20.1"
      DEBUG: "FALSE"
      EULA: "TRUE"
      TYPE: "FABRIC"
      CURSEFORGE_FILES: |-
        architectury-api
        arrp
        aquamirae-fabric
        athena
        badpackets
        bclib
        bette…

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@itzg
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itzg Oct 7, 2026
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@ReticentRobot
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@itzg
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itzg Oct 7, 2026
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@itzg
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itzg Oct 7, 2026
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@ReticentRobot
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@itzg
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itzg Oct 7, 2026
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@ReticentRobot
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@itzg
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itzg Oct 7, 2026
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Answer selected by ReticentRobot
@ReticentRobot
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