Dead corals and coral fans can be pushed by pistons

Confirmed for 1.13.1.

Yeah this is strange, it isn't consistent for me though. They will "false break".

A slime block on top and on the side with Coral attached to the side one, then (slimeblocks) pushed with a piston makes them (Coral) false break.

Confirmed for 1.13.2-pre1.

Confirmed for 1.13.2-pre2.

Confirmed for 19w11b and it happens mainly with slime blocks. There seems to be many problems with coral fans for some reason..

This also allows for TNT duping btw.

Confirmed for 1.14.1, 1.14.2, and 1.14.3.

This is a very bad bug as it allows players to dupe unlimited amounts of TNT in survival. This is not intended as the fix to MC-151 shows. It is also very powerful as the duped primed TNT now drops all blocks in 1.14+.

yeah This bug is very serious that the Devastators can use this bug to easily destroy the server 

Still not fixed for 1.15?

From @unknown on this subredit thread:
— We're a fair ways off from [fixing this issue]. While fishing farms and 0-tick farms were pure exploits that didn't need replacements (lily pads aside), TNT dupers fill a slot in the game that the intended game mechanics still cannot.

This is a fairly good bug, because it allows for quarries. To avoid duplication glitches (like in bedrock edition) dispensers cannot be moved, so it is the only way to make movable tnt, and the only way to get renewable tnt, (other than gravity block dupers).

The dupe glitch using moveable tile entities was apparently fixed in 1.16 for BE, so it's definitely possible to have moveable tile entities without having a dupe glitch.

Confirmed in 1.16-pre3.

Confirmed in 1.16-pre4.

Confirmed in 1.16-pre5.

Please don't change TNT dupers (Or remove them)

Imagine how long it would take to mine out a 128x128 area without quarries

Confirmed in 1.16-pre6. Trying to move a dead coral upwards will display a breaking animation, despite the block not being broken.

Confirmed in 1.16-pre7.

Confirmed in 1.16-pre8.

Confirmed in 1.16-rc1.

@Mods, please remove the completely unrelated image.

Still present in 1.16.1

Confirmed in 1.16.2

Can confirm in 21w03a.

Can confirm in 21w06a.

Can confirm in 1.16.5 and 21w08b.

Relates to MC-203561.

Confirmed for 21w11a.

Can confirm in 1.17.

You probably mean 1.17, as you already confirmed 1.16.5. I can confirm for 1.17. So will there be some intentional game design that can replace tnt duper?

Just to be clear, coral is not needed for tnt dupers. I have many observer-based TNT duping designs. So you shouldn't use that as a point to prevent them from being movable.

Can confirm in 1.17.1 Release Candidate 1.

Can confirm in 1.18.1.

Can confirm in 1.18.2.

Can confirm in 1.19.

Can confirm in 1.19.2.

Can confirm in 23w03a

Can confirm in 23w07a