The Bug

The Marker Entity can trigger the sculk sensor if it is /killed. Other technical entities can do the same, even though when they "die" without /kill, it does not trigger the sculk sesnor. For example, when lingering potions & dragon breath clouds dissipate naturally, there is no sculk signal, but when a cloud is killed with /kill, it does send a signal.

Here are all the entities that trigger the sculk when they are /killed when they shouldn't:

• Area Effect Clouds
• Armor Stands**
• Arrows
• Boats**
• Display Entities: text_display, item_display, block_display
• Evoker Fangs
• Experience Orbs
• Falling Block
• Fireball entities
• Firework Rockets**
• Interaction entity
• Items
• Item Frames & Glow Item Frames
• Leash Knot
• Llama Spit probably
• Marker entities
• Minecart entities**
• Primed TNTs
• Shulker Bullets**
• Thrown Entities: Egg, Ender pearl, Experience Bottle & Snowball

** (It's hard to tell because they tend to trigger the sculk sensor in other ways)

The rule should be that if an entity's death can trigger the sculk sensor without /kill, then it can trigger the sculk with /kill, but if the only way they can "die" is with /kill, then it should not trigger.