What I expect to happen: the fog, once set, should not change depending on the angle of view.
What actually happened: landscape elements are visible when not in the centre of the screen but disappear when in the centre of the screen, without changing anything in the game viewing parametres. See the smaller island (the right one) on the attached screenshots. They all were taken from the same place, -1514 80 3823 on the map with the seed -435130594162764786.
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Confirmed, fog bubble seems to surround crosshair.

Comment from MC-48549:
It's intended, the fog have a cubic shape.
So you can confirm officially this is intended behaviour?
Because - no offense - it looks really poor escpecially on flat terrain.
This is intended or at least accepted as is. But you are right, it doesn't look very good.
I suggest closing this ticket and filing a suggestion, either here or at http://www.reddit.com/r/MinecraftSuggestions
Still in 1.8.4. This only affects some graphics cards, apparently.
Yes, it does look bad on flat terrain (and AMPLIFIED terrain type) and it should be considered a bug, in my opinion, it's a bug, since it doesn't happen in real life. I suggest relating this to MC-1380 and MC-31681.
This is a video I got of it, I have no idea where in the video, but I'm pretty sure it's in there. 🙂
https://www.youtube.com/watch?v=3GVqx7ZOZHY&list=PLP6R40S8L2P2--ujCqHMMWlMEipM0bM2A
Video Time: 20:17

Possible duplicate of MC-93243.

No, maybe related, but I don't think so.
Any AMD or Intel GPU cannot render 'Fancy Fog' the circular rendering of fog.
Results in unloaded chunks being in view no matter how the view distance is set either because of the flat horizontal rendering of fog.
The reason is because Mojang chose the NVidia only extension (GL_NV_fog_distance) which any AMD/Intel GPU cannot render.
No crash report or GPU Driver updates is going to help in this situation with all due respect. We know the reason why and its confirmed that its the NVidia only extension (GL_NV_fog_distance) which is causing this issue.
Thankyou for your time.
Oh by the way I've fixed the Radial Fog rendering with AMD or Intel GPU's.
Just Reply back here if your interested its really easy to fix.
Affects 18w11a
Seems to be fixed for 1.13.
Fixed for 18w31a.

Second opinion?

Has most definitely been fixed in 1.13.

Nope, confirmed on Debian 9.5 on "Intel Core i7-7700HQ" CPU and "Intel Corporation Device 591b" graphics card. Not happening on Windows 7 with "AMD FX-4300" CPU and "AMD Radeon R7 200 Series" graphics card. Actually, on Windows I don't see any fog at all. But on Debian it still behaves like described in the ticket.
Tested both in 18w31a. Please reopen.

Nope, can also confirm on the Windows computer.
Confirmed for 18w32a.
Confirmed for 18w33a.
Confirmed for 1.13.1.
Still a bug for 1.13.2-pre1? I'm not able to reproduce it anymore.

Nope, confirmed for 1.13.2-pre1. It seems to depend on the graphics card.
Fixed for me in 18w43a.

This was claimed to be fixed many times before, it depends on your CPU. Were you able to reproduce it before, on the same computer, the same operating system, the same Java version?
Confirmed for 1.13.2, 18w43a/b/c. Depends entirely on the GPU in my case. The circular fog is rendered on NVIDIA GeForce GTX 1070, while only the straight / flat fog is rendered on Intel HD Graphics 530 (iGPU). Using the same OS, Drivers, and Java versions during the tests.

Affects 1.14.4.
1.15
I think it would be preferable to not have any fog at all in the instanses it would be flat?
I am unable to reproduce this in 1.16-pre4; see this screenshot.
Seems to be fixed in 1.16-pre5; second opinion?

See comment by @unknown:
This was claimed to be fixed many times before, it depends on your CPU. Were you able to reproduce it before, on the same computer, the same operating system, the same Java version?
Oh sorry, I did not see Fabian's comment. I am not sure whether I have had this issue in the past so we will see if anyone else is still experiencing it 🙂

Affects 21w05b
This is fixed (Finally yayyy!) for me in 21w10a on my laptop with an i5-1035g1 using the built-in Intel UHD Graphics

Anyone else who is affected by this bug in 21w05b, but not 21w10a? Or the other way around maybe?
(I can't reproduce this in 1.16.1, even when running the game without GPU, for some reason, even though I'm pretty sure that that was a way I previously reproduced it.)

This bug is fixed in 21w10a.

I think this bug is caused by Optifine. To verify, I created a world in the latest version of Optifine and the "broken" fog, just as shown in the images attached by the bug reporter. Later I opened a new world with the same seed but in the latest version Vanilla (1.16.5) and the fog was fine.
I have attached two images: one shows the first example with the optfine, with the "broken" fog, and the other without optfine with the not "broken" fog

It's definitely not just OptiFine, otherwise it wouldn't be a valid report here.
Also, please edit your comment to have " | thumbnail" after the file name, the image is huge in mails and here.

@JOHN how did you fix it?