What's your server type and plugin version? I've tested all functions about respawning a dragon on paper-1.21, only to find all functions work as expected.
Are you sure the latest plugin is used?

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its 1.21 paper and its the latest enderdragon plugin on spigot, it keeps saying in the chat its spawning and never does and it stacks end crystals on the end portal.

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any updates? i saw someone on spigot has a similar issue.

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I've tested in paper1.21, only to find anything works as expected. That's too spooky.

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I tested again with the latest paper1.21.1 a few minutes ago. With "respawn", "spawn", "respawn_cd" or "auto_respawn", no problems was found. I don't know what happens with your server. Maybe your configuration, some screenshots and description about how to trigger are required.

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the screenshot i posted before is all it does when it tries to respawn it posts in chat "respawning soon" and it never spawns it just places the crystals, someone on spigot said they have the same issue, i dont know what else to say about it.

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Please upload your configuration.
I did see someone providing feedback on this issue on SpigotMC. But I never succeed to reproduce it.

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#You don't need to edit it.
version: 2.3.0

#Enabled: 'Chinese','English'
lang: 'English'

#Enabled: 'Disable','ChatBox','SubTitle','ActionBar'
damage_visible_mode: ActionBar

damage_statistics:

Display how many player at most

limit: 10

#Enabled: 'weight','pc' ('edge' is deprecated!)
#'weight'(edge): means using weight to decide which dragon(including default dragon) to spawn.
#'pc': namely 'priority+chance', dragons(except the default one) will be sorted in descending order of priority, and plugin will sequently try to spawn each dragon(according to respective chance). Once succeed, it will spawn and dragons behind it will be skipped. If all attempts fail, spawn the default one.
special_dragon_jude_mode: 'weight'

#format: ':' ( -> file name; -> positive integer)

For example, if you want to add a new dragon,

you can create a new file named '.yml' in plugins/EnderDragon/setting,

and then add - ':' here

dragon_setting_file:

• 'default:5'

auto_respawn:

You can add more entries without duplicate name according to the format.

task1:
enable: true
world_name: world_the_end
#some examples:
# minute:30 -> respawn every 30 minutes
# hour:4 -> respawn every 4 hours
# day:1,00:00 -> respawn at 00:00 every day
# day:10,14:30 -> respawn at 14:30 every 10 days
# week:6,22:00 -> respawn at 22:00 every Saturday(the 6th day of one week)
# week:7,09:00 -> respawn at 09:00 every Sunday
# month:8,11:43 -> respawn at 11:43,the 8th day every month
# year:200,00:00 -> respawn at 00:00,the 200th day every year
respawn_time: 'hour:2'
task_2:
enable: false
world_name: world_the_end
respawn_time: 'week:7,20:00'

#"respawn_cd" works as accurate countdown, and have an independent system.
#The configuration can be modified with command "/ed respawn_cd".
#"auto_respawn.invulnerable" has same effect on this.
respawn_cd:
enable: true

#if set this to true, player(in survival mode) can't break the end_crystal after auto_respawn starts
crystal_invulnerable: false
#if set this to true, end_crystal can still be crafted or placed,but end_crystal that placed by player cannot respawn the ender_dragon
resist_player_respawn: true
#if set this to true, player cannot gather dragon_breath with glass_bottle
resist_dragon_breath_gather: true
#The gui that will be shown when using "/ed drop gui"
main_gui: main

#The spawn of ender_dragon in these worlds will be ignored by this plugin.
blacklist_worlds:

• 'world'
• 'world_nether'

Ender_dragon spawns with these reasons will be ignored by this plugin.

common options: COMMAND(spawn with /summon), CUSTOM(generate by other plugins), DEFAULT(by nature, including end_crystal)

You can find all spawn reasons here:

https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/event/entity/CreatureSpawnEvent.SpawnReason.html

example: [COMMAND,CUSTOM]

blacklist_spawn_reason: []

#optional: [default/nbt/advanced]
item_format:
reward: default

#Whether hook to other plugins
hook_plugins:
MythicLib: true

#Whether enable script expansion
#Due to dependency loading, this configuration change will only take effect after reloading the server
expansion:
groovy: false

#[true/false]
debug: false

#Do not modify the configuration below unless you know what you are doing
advanced_setting:

In some mohist-server, environment of world may be loaded incorrectly, which affects the respawn function.

You can set this to "true" and reload server to fix it.

world_env_fix: false
save_respawn_status: false
save_bossbar: false
backslash_split:
reward: false

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Unfortunately, it also works fine...

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