[MC-128299] Blocky and fully bright areas appearing underwater

The bug

When placing a block next to the water surface, then all the chunks next to it are fully lighted by the sunlight, even removing the block.

How to reproduce

Video demonstrating the issue: https://www.youtube.com/watch?v=exBP5slGX3Y

Linked issues

is duplicated by 12

MC-128317 Inconsistent water lighting Resolved

MC-128318 Underwater lighting errors Resolved

MC-128328 Light and shadow bugs Resolved

MC-128341 Water lighting error Resolved

MC-129684 Severe lighting issue Resolved

7 more links

relates to 1

MC-128301 Sea lantern light persists Resolved

Attachments

Comments 15

Noam Goldwasser 2018-04-13T14:28:00Z

Looking at this, I think the bug I found is a reproduction of this, though as I said, it's not exactly consistent.

Jennie Ivins 2018-04-19T21:47:57Z

Can confirm in 18w16a. (see pic)

Jennie Ivins 2018-05-11T22:45:01Z

Confirmed in 18w19b.

seed: -8300275442758179407

xyz: 276 69 -289

[media]

Jennie Ivins 2018-05-11T23:39:27Z

So the weird light areas disappear if you do the following:

find the edge and place a block on the dark side
break the block
the light will now return to it's proper faded gradient
[media]

Jennie Ivins 2018-05-15T18:36:19Z

Confirmed for 18w20a.

5 more comments

Rat Dog 2018-05-21T16:39:43Z

Also occuring in 18w20c, and only in old chunks (see attached screenshots of old and new chunks). I am convinced that this issue is somehow related to MC-129725, because there the lighting issue seems to occur in exactly the same way except with caves (and you know, the fact that light is going through solid blocks). I even re-did the pumpkin thing above with a weirdly-lit mineshaft and the same thing happened- although it should be noted that after the pumpkin is removed, either in the ocean or in a cave, it is still an issue because the light area stays "lit" without a light source present, only the edges smooth to blend with the dark area.

Old chunks (Ignore air pockets, that's unrelated issue MC-129625):

[media]

New Ocean:

[media]

Pumpkin Test in mineshaft:

[media][media][media]

Jennie Ivins 2018-05-31T02:09:06Z

Confirmed for 18w22b.

Makzevu 2018-05-31T07:26:45Z

This bug occurs whenever blocks, other than the default generation of the world, are present above water. I made a world in the current snapshot, 18w22b, and placing blocks manually, using /setblock, or using /fill maxes out the light level in the chunk tested in, but only in the water. If too big of an area is used with the /fill command, the light between the fill area and the water will remain at the following places:

1. The corners of each chunk just under the fill area (basically at the corner of a chunk in the area the /fill command was used, the sky light level will always remain at 14. It's just easier to see the light under the fill area since there isn't light down there). Placing a block five blocks under the light will remove it.

2. At the water's surface and one block under it.

After the player leaves the area and comes back to it, the light at the surface of the water will be 13 and will increase to 15 two blocks down. The light level will remain at its maximum until one block below the ocean floor. I don't know if this should be classified as another bug, but it's very closely related if so.

Meri Diana 2018-05-31T09:27:39Z

Could someone please add the info in this comment by @unknown into the bugpost description?

It's easily reproducable by setblock'ing a block above water, see:

[media]

Makzevu 2018-06-04T17:58:29Z

Confirmed for 1.13-pre1.

Makzevu 2018-06-15T21:03:56Z

Confirmed for 1.13-pre2.

Makzevu 2018-06-19T18:04:22Z

This issue relates to MC-129236 and MC-126138 because the water is acting like air. When air doesn't have any blocks above it, its sky light level is based purely on the day-night cycle and rain/storms. The same happens to water with this bug, but the water ignores blocks and rain/storms (is only affected by the day-night cycle). However when it is night, the sky light level of the whole body of water is at 4 instead of 0 further down.

Going back to the bug report, the game thinks the water is supposed to be at the same sky light level air is at based on the day-night cycle. So when the area above the water is updated by any means (except F3 + A), the light is "corrected".

user-2a4c8 2018-06-21T17:04:50Z

Confirmed for 1.13 pre-3

Daniel McCree 2018-06-26T17:55:17Z

Issue still persisting on my 1.13 Pre-4 World. The transparent block will go away when replaced, but will persist after restarting the world, possible fixes for this?

BruinsBeanieMan 2018-06-28T20:03:52Z

Yeah it is still broken for me too.