I've been running into this a lot lately and finally narrowed down a way to reproduce this. Basically, after performing a heavy melee cancel in air, there is an already reported bug where your FOV will decrease for a bit. If you wait until the FOV changes and then slide again, your FOV does this weird snapping zoom thing. Hard to explain, just watch the video.
View attachment Desktop 2025.02.26 - 17.21.37.10.mp4
View attachment Desktop 2025.02.26 - 17.21.37.10.mp4