The Bug
In 20w11a, soul speed did not change your FOV, similar to depth strider's speed increase. However, it now does. This could be because of MC-174502 , since it's movement code was likely changed to remove accelaration and it may now reuse regular speed effect's code. Screenshots are taken with quake pro to make the difference more obvious, two of them have the the soul speed level 3 and other two have soul speed 6 to make it even more obvious.
Steps to Reproduce
Summon a large area of soul soil.
/fill ~-7 ~-1 ~-7 ~7 ~-1 ~7 minecraft:soul_soil
Equip some boots enchanted with soul speed.
/item replace entity @s armor.feet with minecraft:golden_boots{Enchantments:[{id:"soul_speed",lvl:3}]}
Begin walking around on the soul soil to active the soul speed enchantment on the boots, and pay close attention to your field of view as you do this.
Take note as to whether or not your field of view changes when the soul speed enchantment is active.
Observed Behavior
Your field of view changes when the soul speed enchantment is active.
Expected Behavior
Your field of view would not change when the soul speed enchantment is active.
Related issues
is duplicated by
relates to
Attachments
Comments


Yeah, I think all things that effect speed also effect your FOV. For example, use a bow (If you're using Optifine some how then turn off "Dynamic FOV") and your FOV will zoom in, and if you use speed your FOV will zoom out.
Confirmed, though I don't think this is a bug. This relates to MC-175409
As per MC-187114, this is also a parity issue.

Perhaps give an option in video settings to turn off dynamic FOV for speed and sprinting/flying separately? That would be really useful because I think FOV change for sprinting is necessary to know whether or not you are sprinting.

Seems to affect 1.16-pre4; see MC-188805.

Should technically be resolved now, you can negate the fov change of speed and soul speed in settings.

Yes we implemented FOV Effects option based on this issue.

That's good to see, but even so, i don't think is very viable to be changing the slider all the time. Maybe some people want their fov effects enabled, but this specific issue is annoying for them, imo. Anyways, it's up to you guys.
Can confirm in 20w48a. Here's some commands to notice the changes in FOV. Please note that some are unobtainable in survival Minecraft and I've included these so that you are able to visually see the changes.
/give @s netherite_boots{Enchantments:[{id:soul_speed,lvl:3}]}
Noticeable.
/give @s netherite_boots{Enchantments:[{id:soul_speed,lvl:5}]}
Very Noticeable.
/give @s netherite_boots{Enchantments:[{id:soul_speed,lvl:10}]}
Extremely Noticeable.

I agree that this needs to be changed. I enjoy dynamic FOV, but Soul Speed III + sprinting is just too much. It stops being a nice visual indication of speed and starts being a nuisance.
On a related note, I feel like there is a similar issue with Turtle Master II. The FOV gets far too narrow while the effect is active.
Can confirm in 20w51a.
Can confirm in 21w03a.
Can confirm in 21w06a.
Can confirm in 21w13a.

While I don't see this as being an issue, I can confirm this issue in 1.17-pre1.
@unknown You can scale this down by changing your FOV Effects setting under Video settings.

It is an issue because it's a parity break. Can confirm in 1.17 Release Candidate 1.

Can confirm in 1.17.1.

Confirmed with 21w38a
Can confirm in 21w42a. Here are some extra details regarding this problem.
The Bug:
Your field of view changes when the soul speed enchantment is active.
Steps to Reproduce:
Summon a large area of soul soil.
/fill ~-7 ~-1 ~-7 ~7 ~-1 ~7 minecraft:soul_soil
Equip some boots enchanted with soul speed.
/item replace entity @s armor.feet with minecraft:golden_boots{Enchantments:[{id:"soul_speed",lvl:3}]}
Begin walking around on the soul soil to active the soul speed enchantment on the boots, and pay close attention to your field of view as you do this.
Take note as to whether or not your field of view changes when the soul speed enchantment is active.
Observed Behavior:
Your field of view changes when the soul speed enchantment is active.
Expected Behavior:
Your field of view would not change when the soul speed enchantment is active.
Can confirm in 1.18.
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 23w45a

Can confirm in 1.21.4.

Can confirm in 25w18a.