Player Health Indicator Mod 1.21.10 is a later point-release search than the project’s currently published Minecraft 1.21 build. If a 1.21-targeted file fails on 1.21.10, start by treating version mismatch as a primary possibility rather than immediately blaming graphics settings.
Failure at startup usually points to environment mismatch
A mod that cannot initialize may be built against different game mappings, loader APIs, or Java assumptions. Check the exact Minecraft target first, then Fabric Loader, Fabric API, Java, and duplicate files.
A missing indicator is a different class of problem
If the profile reaches the game normally, the mod may be loaded but not rendering. Check the toggle keybind, visibility conditions, and whether another rendering or HUD mod is interfering with the same player-rendering path.
Do not troubleshoot a version that is not actually supported
Configuration changes cannot repair a binary incompatibility. If the package never declared 1.21.10 support, the cleanest result may be to move back to a confirmed Minecraft version rather than spending time on unrelated settings.
Keep logs and changes isolated
Test one new mod at a time and preserve the last known working instance. This makes it easier to distinguish a PlayerHealthIndicators problem from a general modpack or loader failure.
Next steps
Use the homepage for the complete feature, release, FAQ, and download overview. For a clean installation workflow, read the installation and troubleshooting guide.