The minecraft:entity_mount game event, which triggers nearby sculk sensors with a vibration frequency of 6, is normally caused by an entity mounting another entity. However, the event appears to also be triggered by already-mounted entities when the world is loaded, unexpectedly triggering nearby regular and calibrated sculk sensors.

Steps to reproduce

With a player

1. Place one sculk sensor and one calibrated sculk sensor. Feed a redstone signal strength of 6 into the calibrated sculk sensor’s input port.

2. Summon a mountable mob or other mountable entity (e.g. minecart, boat, horse, happy ghast) within the radius of the sculk sensors.

3. While located within the radius of the sculk sensors, disconnect from the world, then reload.

   • ✔ sculk sensors are not triggered

4. Mount on the mob/other entity.

   • ✔ both sculk sensors are triggered as the player has mounted on the mob/other entity

5. While seated on the mob/other entity, disconnect from the world, then reload.

   • ❌ both sculk sensors are triggered again

   • Expected result: the sculk sensors do not trigger again, as the player is already mounted on the mob/other entity

With mobs/other entities

1. Place one sculk sensor and one calibrated sculk sensor. Feed a redstone signal strength of 6 into the calibrated sculk sensor’s input port.

2. Summon two entities within the radius of the sculk sensors. Ensure one entity can be ridden by the other.

3. Disconnect from the world, then reload.

   • ✔ sculk sensors are not triggered

4. Use the /ride command to make one entity ride the other. Ensure the entities are within the radius of the sculk sensors.

   • ✔ both sculk sensors are triggered as an entity has mounted upon another entity

5. Disconnect from the world, then reload.

   • ❌ both sculk sensors are triggered again

   • Expected result: the sculk sensors do not trigger again, as the entities were already mounted on each other