Passengers from Spawn Eggs

The red highlight over pack selection and the 'incompatable' warning is no more.

The two small changes made are:

• The spawnData tag is now replace_with_entity
• The entity_data tag is now nbt

The wording changes were made for better understandability, and the casing change was made to conform with the current migration from camelCase or PascalCase to snake_case.

Spider Jockey Example:

/give @p skeleton_spawn_egg[entity_data={id:"minecraft:marker",data:{replace_with_entity:{id:"minecraft:spider",nbt:{Passengers:[{id:"minecraft:skeleton",HandItems:[{id:"minecraft:bow"}]}],active_effects:[{id:"minecraft:strength",duration:-1}]}}}},item_name='"Spider Jockey Spawn Egg"'] 1

Or with just the 'data' NBT (unchanged):

{replace_with_entity:{id:"minecraft:spider",nbt:{Passengers:[{id:"minecraft:skeleton",HandItems:[{id:"minecraft:bow"}]}],active_effects:[{id:"minecraft:strength",duration:-1}]}}}

Added support for 1.21 (Note: backwards compatability is not planned).

Markers use a 'data' NBT component called "spawnData", which transforms the marker into the 'id' specified, with 'entity_data' as the entity's data.

Spider Jockey Example:

/give @p skeleton_spawn_egg[entity_data={id:"minecraft:marker",data:{spawnData:{id:"minecraft:spider",entity_data:{Passengers:[{id:"minecraft:skeleton",HandItems:[{id:"minecraft:bow"}]}],active_effects:[{id:"minecraft:strength",duration:-1}]}}}},item_name='"Spider Jockey Spawn Egg"'] 1

Or with just the 'data' NBT:

{spawnData:{id:"minecraft:spider",entity_data:{Passengers:[{id:"minecraft:skeleton",HandItems:[{id:"minecraft:bow"}]}],active_effects:[{id:"minecraft:strength",duration:-1}]}}}