[MC-130137] Grass and mycelium don't decay underwater

The bug

Grass and mycelium don't turn into dirt under water.

How to reproduce

Have or place grass underwater

→ Notice that the grass doesn't decay to dirt

Linked issues

is duplicated by 11

MC-130528 the grass does not disappear underwater Resolved

MC-130557 the grass does not disappear underwater Resolved

MC-130747 the grass does not disappear underwater Resolved

MC-131804 Grass and mycelium do not suffocate underwater Resolved

MC-132265 Water does not remove Mycelium Resolved

6 more links

relates to 4

MC-128251 Grass and mycelium can spread to dirt blocks which are submerged under general water Resolved

MC-44658 Water causes Grass to turn into Dirt Resolved

MC-186823 Grass paths don't decay underwater, despite being similar to grass Resolved

MC-192664 Flowing water no longer causes grass and mycelium to decay Resolved

Attachments

it's been over a year, but it's still not fixed. here's a picture of some grass naturally generated under water in a swamp, maybe that'll motivate the Mojang team.png

Comments 23

Jennie Ivins 2018-05-31T23:31:59Z

Is this maybe related to the bug for the grass spreading to underwater that was recently fixed (MC-128251)?

almightyzing 2018-06-28T21:54:03Z

Grum replied about this issue today on Reddit

"No good fix for this, the water now blocks 1 light rather than 3."

Is it possible to tweak the light level required to turn these blocks into dirt to account for the new light blockage values? So instead of requiring the block to have X light level it would now require X+2 light level? Or would that cause other issues?

Makzevu 2018-06-29T03:21:01Z

Is grass and mycelium not being able to grow to dirt at all the same as this report? If this is the case, it would be good to rename the report "Grass and Mycelium don't update when under air or water".

almightyzing 2018-06-29T03:40:55Z

@Doubletoad74

Per the wiki:

"Grass will die and change to dirt after a random time if directly covered by an opaque block or water."

Grass does not turn to dirt when exposed to air under any light level. I assume the same goes for Mycelium. Currently both blocks do turn to dirt when directly covered by an opaque block, so this is only trying to address the water issue.

Makzevu 2018-06-29T03:58:18Z

Sorry, I said that wrong. I meant that any dirt block wont turn to grass or mycelium when next to it (basically grass growing onto dirt, not grass growing to dirt). However I didn't know that dirt can't turn to grass or mycelium under any light level, which pretty much makes my original comment pointless since I tested it at night.

13 more comments

Oxyde89 2018-07-27T16:27:29Z

My server is right now on 1.13 and the mycilium bugs still persist, have half the island underwater and nothing changed to dirt until now..

mrbman11999 2018-07-29T19:10:37Z

I'm in singleplayer with a whole island underwater and it hasn't changed at all. About to just cover it all in dirt/grass.

Tanner Thomas 2018-08-11T01:52:37Z

This is also persistent for grass as well. I placed a 2x2 hole in the ground with grass/mycelium covered by water. I covered the hole with an opaque block, set the time to midnight, and the random tick speed to 300. I waited about 10 seconds, set the tick speed to 0, time set to day, and removed the ceiling and the water. The grass/mycelium remained despite being at light level 0 and underneath water at night.

M. 2018-08-25T20:15:20Z

Minecraft 1.13.1 also being affected

Brianna Schuman 2018-10-12T11:37:07Z

Notes on the impact of this bug on play-ability:

Mycelium is only found in Mushroom biomes which are extremely rare. These are the only biomes in which hostile mobs do not spawn and Mooshrooms do. This combination makes them HIGHLY desirable to build in. Grass and vegetation colors are particularly vibrant in this biome, further enhancing their desirability. Mycelium, however, is not very desirable to look at. However, it is a clear, visual cue about the biome that makes it unique. Previously, clearing swaths of the biome of Mycelium with water was a very significant amount of work that yielded great rewards when done well. This tactic has been used previously by several well known Minecraft YouTubers who used it to great effect. Without this option, the only alternative methods for clearing the mycelium are extremely slow, manually doing it block by block, This significantly decreases the usefulness of the biome for base building and terraforming. Effectively, without a widespread, simpler solution such as the previous water mechanic, this biome is more likely to be skipped over and become useless outside of Mooshroom gathering.

Jennie Ivins 2018-11-16T00:23:28Z

Confirmed for 18w46a.

Grass, Mycelium, Podzol, Grass Paths, and Farmland do not decay underwater.

Erre 2019-03-26T14:02:37Z

1.13.2 mycelium still does not decay under water.....

[Mod] violine1101 2019-03-26T14:03:18Z

1.13.2 is already listed in the affected versions.

Victor K. Andersen 2019-05-29T14:33:51Z

Bug is still present in 1.14.2.

Hirondelline 2019-08-18T22:49:00Z

Still an issue in 1.14.4

Patrick Litton 2019-09-06T23:21:06Z

Still an issue in 19w36a.

Josh Simpson 2019-11-20T01:48:28Z

19w46b here. Just covered my mushroom island in water without knowing this bug still existed. If it doesn't get fixed soon, I'll be manually replacing every mycelium block on the island with grass.

Patrick Litton 2020-03-14T01:03:48Z

I was disappointed to find this hasn't been fixed yet... sigh confirmed for 20w11a...

jonaskill555 2020-03-17T14:14:19Z

Thank you for fixing this bug after 2 years! looking forward to the snapshot!

Gravinser 2020-07-24T12:50:22Z

In snapshot 20w30a grass don't decay under flowing water

Isuru Kusumal Rajapakse 2020-08-01T04:20:32Z

1.16.2-pre1 - grass (nor mycelium) not decaying under flowing water

[media]

anthony cicinelli 2020-08-01T04:51:58Z

Paul Rozhkov & Isuru Kusumal Rajapakse your problem is a different report MC-192664 not this one

George Kidd 2021-02-15T19:06:56Z

Issue seems to be happening in a similar manner in 1.16.5 - Only source blocks and water coming falling off a ledge down onto below grass will decay. Attched images for reference