Inconsistent Time tag for FallingSand

Relates to:

• MC-69356
• MC-35127

Is duplicated by/reason for:

• MC-48107
• MC-76858 (probably)

I don't really understand how the whole FallingSand Time tag should work, but it is definitely pretty strange. First of all, it is a byte which decreases all possibilities in an extreme way. Maybe that should get fixed.

Special time tags:

• 0 despawn just after it was spawned, but doesn't drop an item! and replaces block if it has the same block id
• Any other number will also "replace" the block but leaves a ghost block (MC-72248 or MC-55106)

For whatever reason this happens:

• -128 is some ticks later -124
• -1 is some ticks later 3
• 1 is some ticks later 5
• 127 is some ticks later -125

I really have no clue to what it is counting down, but you can also not prevent this timer to count down...