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Compatibility
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UIcore targets Minecraft 1.21.1 and newer and declares Paper and Folia support. It uses Java 17 bytecode. The server must run the Java version required by its Minecraft/server build. PacketEvents 2.14.0 is required.
The release validation recorded local startup, reload, and shutdown checks on available Paper, Folia, Purpur, and Leaf builds. A test player also opened and closed demo_main on Folia 1.21.11. These results do not mean every interaction or optional integration was tested on every build.
See the compatibility matrix for exact versions and limits. On Folia, keep each menu scene inside the camera's region.
NoChatReports may interfere with signed chat and menu text input on some client setups. In the reported case, disabling the mod and fully restarting the client restored chat. The exact trigger was intermittent and has not been isolated. See the compatibility document for the observed setup and further details.
Test the exact UIcore and server builds together. Check menu interactions, chat input, visibility with multiple players, schematics, reload, and shutdown. Verify optional plugin integrations against their installed versions. Use the smoke checklist.