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Item/Block Deletion! - Droppers! -_-

Items moving on twice through 2 droppers or a dropper and a dispenser with only one redstone pulse

Droppers facing each other act unpredictably when both are powered at once

Hopper interaction is dependent on order of placement, and may break when reloading chunk

Dropper works randomly

Comparator doesn't update properly in a dropper clock in certain conditions (inconsistent behavior) [UPDATE, it's inconsistent behavior with tripwires, not comparators]

After few activations, Dropper gets "jammed" in triggered:true state and won't trigger again.