this is the same issue The timeline set_auto_update(False) no longer works
In short, with the previous interface, when auto_update was false and the simulation playing no render/physics call would have advanced the timeline. Now, every render call advances it.
Now, since for complex scenes the render call is shorter than the time necessary to render the environment for RTX and for Path Tracing a render call advances only spp steps over the totalSpp, we still need multiple render calls to have a correct rendered image. This implies that the timeline would advance multiple times, changing the animations and the positions and the deformations of the animated objects of not just one time step.