Added » Copper Golem support (see https://pandaaaplays.github.io/CustomMobs/Options/CopperGolem).
Added » Mannequin support (see https://pandaaaplays.github.io/CustomMobs/Options/Mannequin).
Added » New Miner custom effect, which allows mobs to detect players threw blocks and mine towards them (see https://pandaaaplays.github.io/CustomMobs/Custom-effects/Miner)
Added » New sounds from the 1.21.9 release.
Added » Support for 1.21.9 NMS (for aggressive mobs to work!)
Updated » Every second Custom effect was changed to "Always" to represent it better.
Updated » Reduced the nearby entity check to trigger custom effects from 32 blocks to 20 blocks to prevent useless lag.
Updated » Now stopping the sounds after 5 seconds when previewing them from the sounds menu.
Fixed » Fireballs (from the custom effect) would break blocks even when breaking the blocks was disabled.
Fixed » Summon items would spawn mobs too high, and they would not always be spawned correctly (in water, for example).

Added » New trail custom effect, which applies fire when the mob moves (a player must be nearby for it to activate). Make sure your mob has fire resistance! ( https://pandaaaplays.github.io/CustomMobs/Custom-effects/Trail)
Updated » Default mob "MegaZombie" was replaced by a "Shark" one without items as it would break when switching from spigot to paper. The ItemStack deserialization breaks when switching (will be fixed eventually).
Updated » Sound radius is now defaulted to 16, to prevent players from thinking they do not work.
Fixed » Spawners with requirements disabled now work as intended, even when buried in the ground (under blocks).
Fixed » Typos or mistakes in GUI items names.
Fixed » Drops given directly to players with full inventory will now drop to their feet instead of vanishing.
Fixed » Dead projectile shooter (such as dead skeleton) would create an error on the console when damaging players.
Fixed » Zombie CustomMobs transforming into drowned would lose their options. CustomMobs now do not transform into drowned.
Fixed » New CustomMobs would be added without the CustomEffects gui (would not show properly until reload).
Fixed » Aggressive CustomMobs of the following types would not be aggressive : Fish, Dolphin, etc. (called WaterMobs) and Bats (called Ambient).
Fixed » Applying infinite potion duration to CustomMobs would not work as intended.

Added » New fireball custom effect, which throws fireball to the player(s) near the CustomMob ( https://pandaaaplays.github.io/CustomMobs/Custom-effects/Fireball)
Added » New boss bar option, with the color and style configurable. This option allows any CustomMob to have a wither/dragon-like boss bar ( https://pandaaaplays.github.io/CustomMobs/Options/Special)
Updated » Default mobs will only be added when creating the Mobs folder (won't be added back when deleted unless the whole folder is deleted).
Updated » Explosion of the explosion custom effect now correctly protects the entity exploding when setting the damage self to off.
Fixed » The infection effect would break completely on Paper.
Fixed » The spawners would not work when changing the name of the CustomMob.
Fixed » The spawner item could not be changed from the spawner menu.

Added » New infection custom effect, which is able to set a potion effect to the hurt player on damage from the CustomMob.
Updated » Removed the default mobs from the bStats metrics!
Fixed » Time would not work correctly when showing only hours and seconds (no minutes).

Fixed » Adding 0.001% of drop chance would set the value to 100% (maximum).
Fixed » Using the /custommobs reload command would multiply the amount of mobs being spawned upon use of the spawn egg.

Note : While these fixes are correcting bugs that are not necessarily impacting you, the second one is pretty major. Please consider updating as soon as possible.

Fixed » Changed the process of setting the CustomMob options and effects as options need to be set before running the effects.
Updated » Hands and armor items in the GUI will now be replaced if they are modified in the CustomMob's configuration.
Added » Included 4 CustomMobs by default with the plugin to show what you can do with it! These mobs are fairly simple and will evolve with updates.
Added » New natural replacement option, accessible on any entity type. This will allow the plugin to replace a percentage of the natural spawning mobs by your CustomMob. The plugin will replace the same entity type (e.g.: Chicken CustomMob with the option set to 50% will replace 1/2 chicken that spawns in the world (naturally) by your chicken CustomMob).
Added » Name visibility can now be toggled. There are now 3 modes : Visible (always), Visible (on hover), hidden.

Added » Support for 1.21.8 (only change is for aggressive animals).

Fixed » Using Paper would break animals aggressivity. It now works as intended!
Fixed » Chickens, Pigs and Cows can now have their variant (Warm, Cold or Temperate) set, even on Paper.
Added » You may now use "~" to indicate coordinates in the CustomMobs summon command.

Fixed » The plugin would throw an error and break when loaded with Paper.