So after a year, I made full release.

WARNING! Mod ID and java package name was changed, so worlds created with beta version of this mod should not work.

Changes

• Reduced lags by removing block entity for butterflowers
• Structures are now locatable
• Fixed butterfly temple test block model
• Improved butterfly guard
  • Butterfly guard have got new model and texture
  • Fixed ai and behavior
  • Changed stats
• Rainbow butterfly gives you beacon-like effects instead of flying
• Improved butterfly movement

Blocks

Butterflower

• Disabled block entity
• Changed butterfly spawning
  • Butterflies can spawn throughout the entire game
  • Butterflies spawn chance is 5% per random tick. (previously 100%)
  • Before: per random tick: if NBT "spawned" = true: spawn butterfly and set NBT "spawned" to false
  • Now: per random tick: if random integer between 1 and 20 = 1: spawn butterfly

Butterfly Temple Test Block

• Fixed UV, texture and texture mapping
• Removed chat messages

Structures

Pillager laboratories

• Pillager laboratories structure is locatable
• Changed rarity

Butterfly temple

• Butterfly temple structure is now lacatable
• Butterfly temple is now jigsaw structure, consisting of two elements
  • butterfly_temple_ground is generating on surface
  • butterfly_temple_underground is generating below butterfly_temple_ground with random rotation
• Replaced slabs in butterfly_temple_ground to blocks
• Fixed butterfly_temple_underground, to make sure that water will not destroy redstone.
• Changed rarity

Entities

Butterfly

• Changed movement, now butterflies are flying low above the surface and they won't fly above 100 Y. (If butterfly is above Y 100, it will fly down)

Butterfly Guard

• Butterfly guard have got new model and texture
• Changed hitbox to match new model
• Fixed behavior to attack players
• Changed despawn distance from 8 to 32 blocks
• Fixed synchronization between Butterfly Guard and Butterfly Temple Test Block
• Removed bossbar
• Changed health from 50 to 100
• Attack strength is 5

Rainbow Butterfly

• Rainbow Butterfly now gives beacon like effects instead of fly
• Effects:
  • Strength 1
  • Haste 2
  • Jump Boost 2

Items

Netherite Pollen Sword

• Fixed attack damage to the same as netherite sword
• Decreased attack speed to 2

Technical changes

• Changed java package name from net.mcreator.butterflies to net.mcreator.legendarybutterflies
• Changed mod ID from butterflies to legendary_butterflies
• Changed mod description