Minor Currently in 1.21 an observed behavior when a player is given a potion effect relating to the player's speed in a BukkitRunnable and the player dies while the runnable is active and respawns. Their movement speed is still effected, such as for speed they are walking faster than normal or slowness makes them slower than normal.
To recreate:
1. Make a BukkitRunnable that applies a speed or slowness potion effect to another Player using{{ .addPotionEffect}} method
2. Kill the Player with the potion effect applied to them
3. Occasionally (Often enough to be observed) the base walking speed of the player will be affected to be faster or slower than the normal movement speed.
4. Player cannot change movement speed themselves even with commands
This is an example of how we are applying this kind of effect
public void testBug(Player player) { new BukkitRunnable() { int ticks = 0; Location location = player.getLocation(); @Override public void run() { // Get their location location = player.getLocation(); // Check if they are dead or if the ability is done if (player.isDead() || ticks >= 140) { cancel(); return; } // Every second run this check if (ticks % 20 == 0) { // Get nearby entities Collection<Entity> nearbyEntities = player.getWorld() .getNearbyEntities(location, 5, 5, 5); // Check each entity nearby for (Entity e : nearbyEntities) { if (e instanceof LivingEntity) { ((LivingEntity) e).addPotionEffect(new PotionEffect( PotionEffectType.SLOWNESS, 60, 2, false, false)); } } } } }.runTaskTimer(getPlugin(), 0, 1); }
