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Type: Bug
Resolution: Fixed
Priority: Minor
Fix Version/s: None
Affects Version/s: None
Labels:
- Bukkit
- scheduler
Environment:

Server: Windows 10, 22H2

Java:

openjdk 21.0.7 2025-04-15 LTS
OpenJDK Runtime Environment Temurin-21.0.7+6 (build 21.0.7+6-LTS)
OpenJDK 64-Bit Server VM Temurin-21.0.7+6 (build 21.0.7+6-LTS, mixed mode, sharing)

Version:
CraftBukkit version 4504-Spigot-270012a-dacd062 (MC: 1.21.5) (Implementing API version 1.21.5-R0.1-SNAPSHOT)
Guidelines Read:
Yes

Using the bukkit scheduler to schedule a repeating task asynchronously will only run it once.

Using the Runnable version of that same method will actually repeat it.

Runs only once:

Bukkit.getScheduler().runTaskTimerAsynchronously(this, task -> {
    System.out.println("test");
}, 0L, 20L);

Repeats:

Bukkit.getScheduler().runTaskTimerAsynchronously(this, () -> {
    System.out.println("test");
}, 0L, 20L);