The enchantment soul speed should only increase your FOV when you are standing on soul sand or soul soil.
However on the newest snapshot 24w18a it causes this visual effect whenever you jump no matter what you are standing on.
Steps to Reproduce:
1. Equip a pair of boots (Any kind) with soul speed (level 1-3)
2. Jump while standing still or when running
3. Observe
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[media]

Confirmed in 24w18a. Turn off FOV effects in accessibility settings to remove the jarring effect.