In the replay viewer, the depth of field option of the shaders has a problem : the focus point is locked at a certain distance. The problem is still here after rendering.
This problem appeared from the 2.4.1 version of the replay mod and occurs in all the next versions. No problem in 2.4.0 and before.

Confirmed issue with 1.16.4 and 2.5.0. It appears that sometimes spectating a player will reset the focus point to where that player is, however it never moves with the camera but stays at that point. I am testing with BSL/Complimentary Shaders.

Yep, and I also tested with other shaders (bbepc, sildurs vibrant...) and it doesn't fix the problem.

The only thing that changed between 2.4.0 and 2.4.1 which seems somewhat relevant is that we prevent Optifine from rendering the hands in 360 mode and while not spectating: https://github.com/ReplayMod/ReplayMod/compare/2ab92f..621587c#diff-e9833ce29337277443d1ccdbd5c24f97b54222ff2929bbd5416f98712dc555da

That doesn't seem directly related though, unless for some reason Optifine does depth of field in the renderHand method.
Optifine is proprietary though, so I'm neither allowed to look at its source code nor to fix it. You're at the mercy of its author.

Ok, thanks for your answer.