This issue appears when OP enter /effect give @e[type=player] health_boost 600 5
which usually means to give players the health boost V effect for 600 seconds, but in the Java Edition Vanilla 1.16.1 server, the health bar could reach 2048 and never disappear again.
Even after the player died, it's still there, has some negative visual influences.
[media][media]
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– Minecraft: Java Edition — Windows, Mac, and Linux
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