Unknownreported this bug
In the boss I made "PreventOtherDrops: true", this option is set to true, but the item continues to drop. This feature does not work with all mythicmobs mobs. and also does not work on effects.
Mythicmobs Mobs config: https://pastebin.com/h1u9V1pq
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Server Log: https://pastebin.com/0Bh1e6kw
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I think you'll ask for the plugin version as well. [Legacy attachment omitted]