same on Playstation(PS5).:

the new 3pp looks very nervous and unstable when you run through dense forests or in close corners in bases.

please Try out the following:
run/sprint in slalom very close passing by the trees/bushes/obstacles.
it`s occuring on all trees/bushes/(low) obstacles with collision.
at tree stumps/roots not higher as my breast/hips.
mainly, the effect of slowing down/zoom near obstacles happens on the side where the crosshair is.
but it has a slightly short clipping if you pass the tree very close to your left with crosshair right, too.
With the crosshair to the left and passing a tree to the left, the effect of stuttering/nervous camera movement seems to be stronger.

Problem of zoom in/out is causing a terrible game-feeling

now try out again like following:
extreme run/sprint/fast sneak in slalom amongst the trees through bushes small trees and close to, other obstacles,
with a heavy bag/plank in your hands(minimal stamina).
Additionally use the zoom now during running/sprinting/sneaking.
change the stances/zoom rapidly.
switch between 1pp and 3pp
do it all together
good forests to try this out are in Livonia
and try it out in a complex base with many walls, stairs, wooden base-logs, tents etc.
try it out at nighttime.

can you stay focussed, not loosing overwiev and orientation???

important: it`s not only the frequent stuttering next to obstacles only. but after 10-15min of extreme slalom-run you can recognize a overall performance drop.